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  • 1.
    Cassel-Lundhagen, Anna
    et al.
    SLU.
    Schmitt, Thomas
    Senckenberg German Entomological Institute, Müncheberg, Germany.
    Wahlberg, Niclas
    Lund University.
    Sarvasová, Lenka
    Slovak Academy of Sciences, Slovakia.
    Konvicka, Martin
    Slovak Academy of Sciences, Slovakia.
    Ryrholm, Nils
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Biology.
    Kanuch, Peter
    Slovak Academy of Sciences, Slovakia; Institute of Biology and Ecology, Slovakia.
    Wing morphology of the butterfly Coenonympha arcania in Europe: Traces of both historical isolation in glacial refugia and current adaptation2020In: Journal of Zoological Systematics and Evolutionary Research, ISSN 0947-5745, E-ISSN 1439-0469, Vol. 58, no 4, p. 929-943Article in journal (Refereed)
    Abstract [en]

    In this study, we examined the evolutionary outcome of and interplay between historic isolation and current selection pressures on traits more or less closely connected to fitness in the Pearly Heath butterfly (Coenonympha arcania) across its range in Europe. We hypothesized that a trait mean is more related to historic events if it has low connection to fitness, while a trait more closely connected with fitness is expected to have a mean that relates more to current selection pressures. In order to test this, we collected 322 butterflies from across the species range in Europe and measured five wing traits relating to size and color patterns. To infer a phylogeographic history for each individual, we sequenced a 594 bp fragment of the COI gene. The morphological data were then analyzed in relation to selected climatic variables and the history of individuals to disentangle which factors best correlated with morphological variation. The results supported our hypothesis in that wing sizes correlated with summer precipitation but not with its inferred location during the last glaciation. Eyespot position, on the other hand, correlated with the history of individuals but not with the analyzed climatic indicators. The sizes of the black spot and the white band, two traits that were expected to have intermediate selection pressure, were associated with both history and current conditions. Thus, this study illustrates the fascinating interplay between events and processes that lead to a specific evolutionary outcome.

  • 2.
    Hillström, Lars
    et al.
    University of Gävle, Department of Mathematics, Natural and Computer Sciences.
    Drummond, H.
    Sanchez Tortosa, F.
    Obligate siblicide in the Brown Booby: An experimental test of the insurance hypothesis2006In: Journal of Ornithology = Journal fur Ornithologie, ISSN 0021-8375, E-ISSN 1439-0361, Vol. 147, no 5, p. 182-182Article in journal (Other academic)
  • 3.
    Hillström, Lars
    et al.
    University of Gävle, Department of Mathematics, Natural and Computer Sciences.
    Gieg, J.
    Lyon, R.
    Siblicidal behavior in relation to food availability in the Cattle Egret: An experimental test of the food amount hypothesis2006In: Journal of Ornithology = Journal fur Ornithologie, ISSN 0021-8375, E-ISSN 1439-0361, Vol. 147, no 5, p. 13-14Article in journal (Other academic)
  • 4.
    Hochberg, Rick
    et al.
    University of Massachusetts Lowell, USA..
    Todaro, M. Antonio
    Araujo, Thiago Q.
    Atherton, Sarah
    Balsamo, Maria
    Chang, Cheon Young
    Di Dimenico, Maikon
    Garraffoni, André R.
    Guidi, Loretta
    Kånneby, Tobias
    Swedish Museum of Natural History.
    Kieneke, Alexander
    Kirk, James J.
    Leasi, Francesca
    Lee, JiMin
    Nesteruk, Teresa
    Dal Zotto, Matteo
    Bownes, Sarah J.
    Cesaroni, Lucia
    Kim, Il-Hoi
    Münter, Lukas
    Perissinotto, Renzo
    A Tribute to William Hummon – Gastrotrich Biologist Extraordinaire2017In: Proceedings of the Biological Society of Washington, ISSN 0006-324X, E-ISSN 1943-6327, Vol. 130, no 1, p. 113-119Article in journal (Other academic)
  • 5.
    Kolicka, Malgorzata
    et al.
    Department of Animal Taxonomy and Ecology, Institute of Environmental Biology, Faculty of Biology, Adam Mickiewicz University in Poznań, Umultowska 89, 61–614 Poznan, Poland.
    Dabert, Miroslawa
    Molecular Biology Techniques Laboratory, Faculty of Biology, Adam Mickiewicz University in Poznań, Umultowska 89, 61–614 Poznań, Poland. .
    Dabert, Jacek
    Department of Animal Morphology, Institute of Environmental Biology, Faculty of Biology, Adam Mickiewicz University in Poznań, Umultowska 89, 61–614 Poznań, Poland..
    Kånneby, Tobias
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Kisielewski, Jacek
    Department of Animal Taxonomy and Ecology, Institute of Environmental Biology, Faculty of Biology, Adam Mickiewicz University in Poznań, Umultowska 89, 61–614 Poznan, Poland. .
    Bifidochaetus, a new Arctic genus of freshwater Chaetonotida (Gastrotricha) from Spitsbergen revealed by an integrative taxonomic approach2016In: Invertebrate systematics, ISSN 1445-5226, E-ISSN 1447-2600, Vol. 30, no 4, p. 398-419, article id IS16001Article in journal (Refereed)
    Abstract [en]

    Gastrotricha is a cosmopolitan phylum of aquatic and semi-terrestrial invertebrates that comprises ~820 described species. To date, freshwater gastrotrichs have not been the subject of faunistic or taxonomic research in the polar regions. In this paper, we present the first species-level description of a freshwater gastrotrich from the Arctic (Svalbard Archipelago). Evidence from morphology, morphometry and molecular analyses reveals that the species represents a new genus in Chaetonotidae: Bifidochaetus arcticus, gen. et sp. nov. Taking into consideration many morphological similarities to Chaetonotus (Primochaetus) veronicae Kånneby, 2013 we propose to include C. (P.) veronicae in the newly established genus under the new combination Bifidochaetus veronicae (Kånneby, 2013), comb. nov. In the phylogenetic analysis based on nuclear 18S rRNA, 28S rRNA and mitochondrial cytochrome c oxidase subunit I sequence data, B. arcticus, gen. et sp. nov. is nested within the family Chaetonotidae, as the sister group to the genus Lepidochaetus Kisielewski, 1991. In this paper we also present new taxonomic characters useful for gastrotrich taxonomy: the pharynx-to-intestine length ratio (I) and the spine bifurcation ratio (B).

  • 6.
    Kånneby, Tobias
    Naturhistoriska riksmuseet, Enheten för zoologi.
    A redescription of Chaetonotus (Primochaetus) veronicae Kånneby, 2013 (Gastrotricha: Chaetonotidae)2015In: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 4027, no 3, p. 442-446Article in journal (Refereed)
    Abstract [en]

    Gastrotricha are microscopic metazoan animals common to both freshwater and marine environments. A re-examination of Chaetonotus (Primochaetus) veronicae Kånneby, 2013, described from northern Sweden, revealed an important diagnostic character (bifurcated spines) that had been overlooked in the original description (Kånneby 2013).

  • 7.
    Kånneby, Tobias
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Gastrotricha of Sweden - Biodiversity and Phylogeny2011Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Gastrotricha are small aquatic invertebrates with approximately 770 known species. The group has a cosmopolitan distribution and is currently classified into two orders, Chaetonotida and Macrodasyida. The gastrotrich fauna of Sweden is poorly known: a couple of years ago only 29 species had been reported. In Paper I, III, and IV, 5 freshwater species new to science are described. In total 56 species have been recorded for the first time in Sweden during the course of this thesis. Common species with a cosmopolitan distribution, e. g. Chaetonotus hystrix and Lepidodermella squamata, as well as rarer species, e. g. Haltidytes crassus, Ichthydium diacanthum and Stylochaeta scirtetica, are reported. In Paper II molecular data is used to infer phylogenetic relationships within the morphologically very diverse marine family Thaumastodermatidae (Macrodasyida). Results give high support for monophyly of Thaumastodermatidae and also the subfamilies Diplodasyinae and Thaumastodermatinae. In Paper III the hypothesis of cryptic speciation is tested in widely distributed freshwater gastrotrichs. Heterolepidoderma ocellatum f. sphagnophilum is raised to species under the name H. acidophilum n. sp. The results indicate that L. squamata may be a complex of at least two species. In Paper III and V the phylogeny of Chaetonotidae (Chaetonotida), the largest family within Gastrotricha, is inferred. The group suffers from a troubled taxonomy and is hypothesized to be nonmonophyletic. Results show that members of Dasydytidae are nested within the group. Since only 3 of 17 sampled genera are monophyletic, it is hypothesized that the cuticular structures used in current classification do not reflect phylogenetic relationships. The phylogenetic hypothesis generated in Paper V indicates a marine origin of the predominantly limnic Chaetonotidae with a subsequent secondary invasion to marine environments of some taxa.

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  • 8.
    Kånneby, Tobias
    Naturhistoriska riksmuseet, Enheten för zoologi.
    New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden2011In: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 3115, p. 29-55Article in journal (Refereed)
    Abstract [en]

    Gastrotricha is a small phylum of acoelomatic aquatic invertebrates common in both marine and freshwater environments. The freshwater gastrotrich fauna of Sweden is poorly known and so far only 20 species have been reported. In this study two species, Heterolepidoderma joermungandri n. sp. and H. trapezoidum n. sp., are described as new to science. Moreover, 9 species are presented as new to the Swedish fauna. Additional taxonomic information is also given for 4 species previously reported from the country. In total 7 genera of two families, Chaetonotidae and Dasydytidae, are presented and the number of reported freshwater gastrotrichs from the country is increased to 31.

  • 9.
    Kånneby, Tobias
    Naturhistoriska riksmuseet, Enheten för zoologi.
    New species and records of freshwater Chaetonotus (Gastrotricha: Chaetonotidae) from Sweden2013In: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 3701, no 5, p. 551-588Article in journal (Refereed)
    Abstract [en]

    Chaetonotus is the most speciose genus of the family Chaetonotidae within Gastrotricha, a small phylum of aquatic acoe-lomate invertebrates. The freshwater gastrotrich fauna of Sweden has been studied during the last five years and so far 44 species have been reported in the literature from the country. This study describes the new species, Chaetonotus (Pri-mochaetus) veronicae n. sp., and reports 9 species new to the Swedish fauna raising the known number of freshwater spe-cies from the country to 54. Some records stand out from a biogeographic point of view: Chaetonotus (Primochaetus) soberanus is reported for the first time from Europe and Chaetonotus (Chaetonotus) arethusae, Chaetonotus (Chaetonotus) naiadis and Chaetonotus (Hystricochaetonotus) euhystrix are reported for the first time outside the countries from which they were originally described.

  • 10.
    Kånneby, Tobias
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Phylum Gastrotricha2016In: Keys to Nearctic Fauna: Thorp and Covich's Freshwater Invertebrates / [ed] Thorp, J., Rogers, D.C., Academic Press , 2016, 4, p. 115-130Chapter in book (Other academic)
  • 11.
    Kånneby, Tobias
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Atherton, Sarah
    Department of Biology, University of Massachusetts Lowell, Lowell, MA 01854, USA.
    Hochberg, Rick
    Department of Biology, University of Massachusetts Lowell, Lowell, MA 01854, USA.
    Two new species of Musellifer (Gastrotricha: Chaetonotida) from Florida and Tobago and the systematic placement of the genus within Paucitubulatina2014In: Marine Biology Research, ISSN 1745-1000, E-ISSN 1745-1019, Vol. 10, no 10, p. 983-995Article in journal (Refereed)
    Abstract [en]

    Two new species of marine Gastrotricha, Musellifer reichardti sp. nov. and Musellifer tridentatus sp. nov. (Chaetonotida: Paucitubulatina: Muselliferidae), are described from the Atlantic coast of Florida (USA) and the west coast of Tobago (Trinidad and Tobago), respectively. Both new species are peculiar in that they lack a muzzle bearing the mouth, which is a diagnostic character of the genus. They correspond well to the diagnosis of Musellifer in other morphological features, and genetic data from the 18S rDNA gene of M. reichardti sp. nov. further support the inclusion of the new species in the genus Musellifer. Musellifer reichardti sp. nov. is distinguished by the following combination of characters: blunt head with reduced muzzle; dorsal patches of naked cuticle bearing sensory cilia on either side of the head; ventral locomotory cilia restricted to the pharyngeal region; spined scales; caudal furca with naked adhesive tubes. The new species is a simultaneous hermaphrodite with posterior paired ovaries, paired testes located at mid-body length, and a posterior frontal organ. M. tridentatus sp. nov. is the first species within the genus exhibiting two types of dorsal/lateral scales: anteriormost dorsal and lateral trident-shaped scales and smooth strongly overlapping dorsal scales. The systematic placement of Musellifer within the Paucitubulatina is discussed and emended diagnoses are given for Muselliferidae and Musellifer.

  • 12.
    Kånneby, Tobias
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Bernvi, David C
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Distribution, delimitation and description of species of Archaphanostoma (Acoela)2014In: Zoologica Scripta, ISSN 0300-3256, E-ISSN 1463-6409, Vol. 44, no 2, p. 218-231Article in journal (Refereed)
    Abstract [en]

    Acoela is a small group of microscopic marine worms that live interstitially in sandy or muddy sediments. Although Acoela is an abundant group of the meiofauna, knowledge of their diversity is incomplete. The Swedish fauna with 66 nominal species is one of the best studied in the world. Despite this new species and species new to the area are still found in Swedish waters. In this study, we describe four new species belonging to the family Isodiametridae: Archaphanostoma fontaneti sp. n., Archaphanostoma occulta sp. n., Archaphanostoma sublittoralis sp. n. and Archaphanostoma ylvae sp. n. The new species were collected on the Swedish west coast and in northern Germany during 2011. Each description is accompanied by drawings and microphotographs. Nucleotide sequences for the ribosomal genes 18S rRNA and 28S rRNA as well as for the mitochondrial COI mtDNA gene have been determined for the new species and used in Bayesian and maximum-likelihood analyses to further support their classification. Diagnostic molecular characters are presented for each species, and we use Bayesian methods and statistical parsimony to delimit the new species within Archaphanostoma. We also use species of Archaphanostoma to test patterns of acoel diversity.

  • 13.
    Kånneby, Tobias
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Hochberg, Rick
    Department of Biology, University of Massachusetts Lowell, Lowell, MA 01854, USA.
    Phylum Gastrotricha2015In: Ecology and General Biology: Thorp and Covich's Freshwater Invertebrates / [ed] Thorp, J. and Rogers, D. C., Academic Press , 2015, 4, p. 211-223Chapter in book (Other academic)
  • 14.
    Kånneby, Tobias
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Four new species of Acoela from Chile2013In: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 3736, no 5, p. 471-485Article in journal (Refereed)
    Abstract [en]

    Acoels are with few exceptions marine worms and a common component of the interstitial meiofauna. In this study we present new species to science belonging to Isodiametridae and Solenofilomorphidae. The new species, Isodiametra finkei n. sp., Postaphanostoma nilssoni n. sp., Pseudaphanostoma hyalinorhabdoida n. sp. and Solenofilomorpha pellucida n. sp. were all collected in Chile during March 2012. Nucleotide sequences for the ribosomal genes 18S rDNA and 28S rDNA as well as COI mtDNA have been determined for the new species and used in a maximum likelihood analysis to further support their classification.

  • 15.
    Kånneby, Tobias
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Kirk, James, J.
    A new species of Redudasys (Gastrotricha: Macrodasyida: Redudasyidae) from the United States2017In: Proceedings of the Biological Society of Washington, ISSN 0006-324X, E-ISSN 1943-6327, Vol. 130, no 1, p. 128-139Article in journal (Refereed)
    Abstract [en]

    A new species of Redudasys (Macrodasyida: Redudasyidae) is described from Texas and Oregon, U.S.A. A single Texas specimen was reported (but not formally described and named) in 2014 from an artesian outflow in Spring Lake, San Marcos, Texas. The Texas specimen provided the first record of Redudasys from outside Brazil. Fifteen specimens were found and studied in 2015 and 2016 from sand pockets among boulders in the Little Nestucca River, near Pacific City, Oregon. Redudasys neotemperatus n. sp. is morphologically and genetically distinguishable from Redudasys fornerise K(isielewski, 1987a), the only formally described species in the genus up until now, and morphologically distinguishable from ‘‘Redudasys sp.’’, an unnamed form reported by Garraffoni et al. in 2010 without genetic information. The Texas and Oregon specimens agree well morphologically and genetically.

  • 16.
    Kånneby, Tobias
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Todaro, M. Antonio
    Department of Biology, University of Modena and Reggio Emilia, Modena, Italy.
    A new species of Aspidiophorus (Gastrotricha: Chaetonotidae) from the Swedish west coast2017In: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 4290, no 2, p. 390-394Article in journal (Refereed)
    Abstract [en]

    Gastrotricha is a group of small aquatic acoelomate animals with more than 820 species worldwide (Balsamo et al. 2015). The Swedish gastrotrich fauna today comprises 94 nominal species of which 40 are marine and 54 are freshwater (Curini-Galletti et al. 2012; Kånneby 2011). Of these, 69 species belong to the order Chaetonotida Remane, 1925 and 25 species belong to the order Macrodasyida Remane, 1925. Compared to other relatively well investigated countries in the region, the Swedish marine Gastrotrich fauna of the west coast appears fairly surveyed. In fact, 38 species have been recorded from Norway (Clausen 2004; Schmidt 1972), while 15 species have been recorded from the seas surrounding the Danish mainland (Grilli et al. 2010). The Swedish brackish waters of the Baltic have a lower diversity and so far only 7 species are known from this area (Kånneby 2011; unpublished observations). By comparison, 31 species have been recorded from the Polish Baltic coast (Hummon 2008; Kolicka et al. 2015). In this paper we describe a new species of Aspidiophorus found during an intensive research on the gastrotrich fauna of the surroundings of the Sven Lovén Centre for Marine Sciences (Kristineberg) on the Swedish west coast carried out in the summer of 2009.

  • 17.
    Kånneby, Tobias
    et al.
    Swedish Museum of Natural History .
    Todaro, M. Antonio
    Department of Biology, University of Modena and Reggio Emilia, Italy.
    Jondelius, Ulf
    Swedish Museum of Natural History.
    A phylogenetic approach to species delimitation in freshwater Gastrotricha from Sweden2012In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 683, p. 185-202Article in journal (Refereed)
    Abstract [en]

    Gastrotricha is a cosmopolitan group of aquatic invertebrates. To date approximately 765 species have been described. This study is the first to deal with species delimitation and cryptic species of freshwater Gastrotricha. Three commonly encountered species, Heterolepidoderma ocellatum, Lepidochaetus zelinkai and Lepidodermella squamata, are investigated for cryptic speciation. Most of the material is based on Swedish specimens but closely related species from other parts of the world are also included. Taxonomic revisions are supported by phylogenies based on 18S rRNA, 28S rRNA and COI mtDNA of freshwater Chaetonotidae from several genera and inferred from Bayesian and maximum likelihood approaches. Heterolepidoderma ocellatum f. sphagnophilum is raised to species level, becoming H. acidophilum n. sp. Moreover, genetic data based on COI indicates high variation between two morphologically very similar groups of Lepidodermella squamata. The extent of cryptic speciation in L. zelinkai appears low. Based on the phylogenetic hypothesis presented in this paper the new species, Lepidodermella intermedia n. sp., from northernSweden is also described. The phylogenetic hypothesis generated show that Chaetonotidae is a non-monophyletic group.  

  • 18.
    Kånneby, Tobias
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Todaro, M. Antonio
    Department of Biology, University of Modena and Reggio Emilia, Modena, Italy.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    One new species and records of Ichthydium Ehrenberg, 1830 (Gastrotricha: Chaetonotida) from Sweden with a key to the genus2009In: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 2278, p. 26-46Article in journal (Refereed)
    Abstract [en]

    The freshwater gastrotrich fauna of Sweden is poorly known. Only seven species of freshwater gastrotrichs have been reported so far. This paper is the first in a series of contributions about the Swedish freshwater gastrotrich fauna. Here we describe one new species, Ichthydium skandicum n. sp., from Jämtland, northern Sweden. The new species falls within the boundary of the subgenus Forficulichthys and is morphologically closest to Ichthydium tanytrichum from which it can be differentiated based on the presence of four pairs of dorsal, keeled scales in the posterior trunk region. Moreover, we provide morphometric data for three additional Ichthydium species: I. diacanthum, I. squamigerum and I. tanytrichum, Italian species all of which are reported for the first time outside Italy. Considering the accompanying fauna, a total of thirteen freshwater Gastrotricha are reported for the first time from Sweden. Finally we present a dichotomous key for Ichthydium along with distributional data of the species considered.

  • 19.
    Kånneby, Tobias
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Todaro, M. Antonio
    Department of Biology, University of Modena and Reggio Emilia, Modena, Italy.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Phylogeny of Chaetonotidae and other Paucitubulatina (Gastrotricha: Chaetonotida) and the colonization of aquatic ecosystems2013In: Zoologica Scripta, ISSN 0300-3256, E-ISSN 1463-6409, Vol. 42, no 1, p. 88-105Article in journal (Refereed)
    Abstract [en]

    Chaetonotidae is the largest family within Gastrotricha with almost 400 nominal species represented in both freshwater and marine habitats. The group is probably non-monophyletic and suffers from a troubled taxonomy. Current classification is to a great extent based on shape and distribution of cuticular structures, characters that are highly variable. We present the most densely sampled molecular study so far where 17 of the 31 genera belonging to Chaetonotida are represented. Bayesian and maximum likelihood approaches based on 18S rDNA, 28S rDNA and COI mtDNA are used to reconstruct relationships within Chaetonotidae. The use of cuticular structures for supra-specific classification within the group is evaluated and the question of dispersal between marine and freshwater habitats is addressed. Moreover, the subgeneric classification of Chaetonotus is tested in a phylogenetic context. Our results show high support for a clade containing Dasydytidae nested within Chaetonotidae. Within this clade, only three genera are monophyletic following current classification. Genera containing both marine and freshwater species never form monophyletic clades and group with other species according to habitat. Marine members of Aspidiophorus appear to be the sister group of all other Chaetonotidae and Dasydytidae, indicating a marine origin of the clade. Halichaetonotus and marine Heterolepidoderma form a monophyletic group in a sister group relationship to freshwater species, pointing towards a secondary invasion of marine environments of these taxa. Our study highlights the problems of current classification based on cuticular structures, characters that show homoplasy for deeper relationships.

  • 20.
    Kånneby, Tobias
    et al.
    Stockholms universitet, Avdelningen för zoologisk systematik och evolutionsforskning.
    Todaro, M. Antonio
    Jondelius, Ulf
    Stockholms universitet, Avdelningen för zoologisk systematik och evolutionsforskning.
    Phylogeny of Chaetonotidae (Gastrotricha) inferred from nuclear and mitochondrial genesManuscript (preprint) (Other academic)
    Abstract [en]

    Chaetonotidae is the largest family within Gastrotricha with almost 400 nominal species, represented in both freshwater and marine habitats. The group is probably non-monophyletic and suffers from a troubled taxonomy. Current classification is to a great extent based on shape and distribution of cuticular structures, characters that are highly variable. We present the most densely sampled molecular study so far where 17 out of 31 genera belonging to Chaetonotida are represented. Bayesian and maximum likelihood approaches based on 18S rDNA, 28S rDNA and COI mtDNA are used to reconstruct relationships within Chaetonotidae. The use of cuticular structures for supra-specific classification within the group is evaluated and the question of dispersal between marine and freshwater habitats is addressed. Moreover the subgeneric classification of Chaetonotus is tested in a phylogenetic context. Our results show high support for a clade containing Dasydytidae nested within Chaetonotidae. Within this clade only 3 genera are monophyletic following current classification. Genera containing both marine and freshwater species never form monophyletic clades and group with other species according to habitat. Marine members of Aspidiophorus appear to be the sister group of all other Chaetonotidae and Dasydytidae, indicating a marine origin of the clade. Halichaetonotus and marine Heterolepidoderma form a monophyletic group in a sister group relationship to freshwater species, pointing towards a secondary invasion to marine environments of these taxa. Our study shows the problems of current classification based on cuticular structures, characters that show homoplasy for deeper relationships.

  • 21.
    Kånneby, Tobias
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Wicksten, Mary K.
    Texas A & M University, TX, USA.
    First record of the enigmatic genus Redudasys Kisielewski, 1987 (Gastrotricha: Macrodasyida) from the Northern hemisphere2014In: Zoosystema, ISSN 1280-9551, E-ISSN 1638-9387, Vol. 36, no 4, p. 723-733Article in journal (Refereed)
    Abstract [en]

    Gastrotricha Metschnikoff, 1865 is a small phylum of acoelomatic animals common in both marine and freshwater environments. To date, close to 800 species are known from all over the world. The order Macrodasyida Remane, 1925 [Rao & Clausen, 1970] is almost exclusively marine except for the rare genera Marinellina Ruttner-Kolisko, 1955 and Redudasys Kisielewski, 1987. In this study, we present morphological and molecular data for a potentially new species of Redudasys from the Edwards Aquifer, Texas, USA. It is the first record of the genus from the Northern hemisphere. It has only previously been reported from Brazil. The Texan specimen, designated as Redudasys sp., has a single pair of anterior adhesive tubes and is considerably shorter than the specimens reported from Brazil. Molecular data from the 18S rRNA and COI mtDNA genes support a close relationship of Redudasys sp. to Redudasys fornerise Kisielewski, 1987. Barcodes are provided for both Redudasys sp. and R. fornerise. The limited material obtained does not justify the description of a new species, but the record is certainly important from a biogeographical standpoint. The colonization and invasion of marine species into freshwater habitats, in particular those of the Edwards Aquifer, is discussed. Although certain marine gastrotrichs appear to have an astonishing ability to adapt to changes in salinity Redudasys is likely to be a marine relic.

  • 22.
    Ryrholm, Nils
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences, Biology.
    Johansson, Niklas
    Shaw, Mark
    National Museums of Scotland,.
    The Swedish species of Cidaphus (Hymenoptera, Ichneumonidae, Mesochorinae), a new genus and three new species for Sweden2017In: Entomologisk Tidskrift, ISSN 0013-886X, Vol. 138, no 3-4, p. 203-208Article in journal (Refereed)
    Abstract [en]

    The ichneumonid genus Cidaphus Förster, 1869, and its three known European species Cidapus areolatus (Boie, 1850), C. alarius (Gravenhorst, 1829) and C. atricillus (Haliday, 1839) are reported as new to Sweden based primarily on specimens collected in light traps during projects monitoring nocturnal moths. The available material indicates that C. areolatus is a rather abundant and widespread species throughout most of the southern and central parts of Sweden. The trapping data indicates that it flies in one prolonged generation from July until October. Cidaphus atricillus and C. alarius are both rather rare and their distribution is much less clear, but both species appear to fly earlier in the season than C. areolatus.

  • 23. Schwank, Peter
    et al.
    Kånneby, Tobias
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Contribution to the freshwater gastrotrich fauna of wetland areas of southwestern Ontario (Canada) with redescriptions of seven species and a check-list for North America2014In: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 3811, no 4, p. 463-490Article in journal (Refereed)
    Abstract [en]

    This study gives additional, detailed information on the freshwater gastrotrich species described and reported from the southwestern regions of Ontario and New Brunswick, Canada by Schwank (1990). Aspidiophorus ontarioniensis, Chaetonotus (Chaetonotus) furculatus, Chaetonotus (Chaetonotus) ontariensis, Chaetonotus (Primochaetus) annae, Ich-thydium malleum, Lepidodermella forficulata and Setopus lemnicola are all redescribed. In addition, a complete list of freshwater species currently known from North America is given.

  • 24.
    Stach, Thomas
    et al.
    Freie Universität Berlin, Germany; Kristineberg Marine Research Station, 45034 Fiskebäckskil, Sweden.
    Dupont, Samuel
    Kristineberg Marine Research Station, 45034 Fiskebäckskil, Sweden.
    Israelson, Olle
    Museum of Evolution, Uppsala University.
    Fauville, Geraldine
    Kristineberg Marine Research Station, 45034 Fiskebäckskil, Sweden.
    Nakano, Hiroaki
    Kristineberg Marine Research Station, 45034 Fiskebäckskil, Sweden.
    Kånneby, Tobias
    Kristineberg Marine Research Station, 45034 Fiskebäckskil, Sweden.
    Thorndyke, Mike
    Kristineberg Marine Research Station, 45034 Fiskebäckskil, Sweden.
    Nerve cells of Xenoturbella bocki (phylum uncertain) and Harrimania kupfferi (Enteropneusta) are positively immunoreactive to antibodies raised against echinoderm neuropeptides2005In: Journal of the Marine Biological Association of the United Kingdom, ISSN 0025-3154, E-ISSN 1469-7769, Vol. 85, no 6, p. 1519-1524Article in journal (Refereed)
    Abstract [en]

    The phylogenetic position of Xenoturbella spp. has been uncertain since their discovery in 1949. It has been recently suggested that they could be related to Ambulacraria within Deuterostomia. Ambulacraria is a taxon that has been suggested to consist of Hemichordata and Echinodermata. The hypothesis that X. bocki was related to Ambulacraria as well as the hypothesis of a monophyletic Ambulacraria is primarily based on the analysis of DNA sequence data. We tested both phylogenetic hypotheses using antibodies raised against SALMFamide 1 and 2 (S1, S2), neuropeptides isolated from echinoderms, on X. bocki and the enteropneust Harrimania kupfferi. Both species showed distinct positive immunoreactivity against S1 and S2. This finding supports the Ambulacraria-hypothesis and suggests a close phylogenetic relationship of X. bocki to Ambulacraria. In particular, the presence of immunoreactivity against S2 can be interpreted as a synapomorphy of Enteropneusta, Echinodermata, and Xenoturbella spp.

  • 25.
    Strand, Malin
    et al.
    Swedish Species Information Centre, Swedish University of Agricultural Sciences, Sven Lovén Centre for Marine Sciences, Tjärnö, SE-452 96 Strömstad, Sweden.
    Herrera-Bachiller, Alfonso
    EU–US Marine Biodiversity Research Group, Instituto Franklin, Universidad de Alcalá & Departamento de Ciencias de la Vida, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain.
    Nygren, Arne
    Department of Biology and Environmental Sciences, University of Gothenburg, Box 463, SE-405 30 Gothenburg, Sweden.
    Kånneby, Tobias
    Naturhistoriska riksmuseet, Enheten för zoologi.
    A new nemertean species: what are the useful characters for ribbon worm descriptions?2014In: Journal of the Marine Biological Association of the United Kingdom, ISSN 0025-3154, E-ISSN 1469-7769, Vol. 94, no 02, p. 317-330Article in journal (Refereed)
    Abstract [en]

    In recent years the Norwegian Taxonomy Initiative started thorough investigations of poorly known organism groups. In this context, several marine inventories have rendered a number of marine invertebrate species new to science. Within the phylum Nemertea (ribbon worms) a characteristic hoplonemertean was encountered on two different occasions. We describe the new species Amphiporus rectangulus sp. nov. with a combination of histology and DNA data (COI). For the morphological description we use a previously proposed character matrix and, in a context given by the results, also provide a brief discussion on benefits and drawbacks with both methods. We argue that for small animals with soft bodies external characters can be more informative than hitherto expected.

  • 26.
    Sundberg, Per
    et al.
    University of Gothenburg.
    Andrade, Sonia
    IB-Universidade de Sao Paulo, Brazil.
    Bartolomaeus, Thomas
    University of Bonn, Germany.
    Beckers, Patrick
    University of Bonn, Germany.
    von Döhren, Jörn
    University of Bonn, Germany.
    Krämer, Daria
    University of Bonn, Germany.
    Gibson, Ray
    Giribet, Gonzalo
    Harvard University, Cambridge, MA, USA.
    Herrera-Bachiller, Alfonso
    Universidad de Alcalá, Spain.
    Junoy, Juan
    Universidad de Alcalá, Spain.
    Kajihara, Hiroshi
    Hokkaido University, Japan.
    Kvist, Sebastian
    Royal Ontario Museum, Toronto, Canada; University of Toronto, Canada.
    Kånneby, Tobias
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Sun, Shi-Chun
    Ocean University of China, Qingdao, China.
    Thiel, Martin
    Universidad Catolica del Norte, Chile.
    Turbeville, James
    Virginia Commonwealth University, VA, USA.
    Strand, Malin
    University of Gothenburg, Department of Zoology, P.O. Box 463, SE-405 30 Gothenburg, Sweden.
    The future of nemertean taxonomy (phylum Nemertea) — a proposal2016In: Zoologica Scripta, ISSN 0300-3256, E-ISSN 1463-6409, Vol. 45, no 6, p. 579-582Article in journal (Refereed)
  • 27.
    Sundberg, Per
    et al.
    Göteborgs universitet.
    Chernyshev, Alexey V
    Russian Academy of Sciences.
    Kajihara, Hiroshi
    Kånneby, Tobias
    Stockholms universitet, Zoologiska institutionen.
    Strand, Malin
    Göteborgs universitet.
    Character-matrix based descriptions of two new nemertean (Nemertea) species2009In: Zoological Journal of the Linnean Society, ISSN 0024-4082, E-ISSN 1096-3642, Vol. 157, no 2, p. 264-294Article in journal (Refereed)
    Abstract [en]

    Ribbon worms (phylum Nemertea) have traditionally been described and classified based on a combination of internal and external morphological characters. The extent, and wealth of details, of these descriptions vary both over time and amongst authors. In addition, definitions of characters and character states are in many cases vague, causing problems both for identification and in phylogenetic analyses. Here, we suggest a system of describing nemerteans based on a list of characters and their states with the actual description in the form of a vector of character state symbols. We argue that this system makes it easier for other systematists to extract the necessary characters/character states for comparative and phylogenetic analyses. The proposed list of characters can also act as a checklist for nemertean description, whereby hopefully ambiguities (such as does the nonmentioning of a character actually mean 'missing' or just not looked for) can be avoided in the future. We describe two new species and one new genus Carinina ochracea sp. nov. and Raygibsonia bergi gen. et sp. nov. using this concept in combination with molecular analyses based on 18S and cytochrome oxidase I (COI) DNA sequences.

  • 28.
    Todaro, M. Antonio
    et al.
    Department of Biology, University of Modena and Reggio Emilia, Modena, Italy.
    Dal Zotto, Matteo
    Department of Biology, University of Modena and Reggio Emilia, Modena, Italy.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Hochberg, Rick
    Department of Biology, University of Massachusetts Lowell, Lowell, MA 01854, USA.
    Hummon, William D.
    Department of Biological Sciences,Ohio University, Athens, Ohio, United States of America.
    Kånneby, Tobias
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Rocha, Carlos E. F.
    Departamento de Zoologia, Instituto de Biocieˆncias, Universidade de Sa˜o Paulo, Sa˜o Paulo, Brazil.
    Gastrotricha: A Marine Sister for a Freshwater Puzzle2012In: PLOS ONE, E-ISSN 1932-6203, Vol. 7, no 2, article id e31740Article in journal (Refereed)
    Abstract [en]

    Within an evolutionary framework of Gastrotricha Marinellina flagellata and Redudasys fornerise bear special interest, as they are the only Macrodasyida that inhabit freshwater ecosystems. Notwithstanding, these rare animals are poorly known; found only once (Austria and Brazil), they are currently systematised as incertae sedis. Here we report on the rediscovery of Redudasys fornerise, provide an account on morphological novelties and present a hypothesis on its phylogenetic relationship based on molecular data. Specimens were surveyed using DIC microscopy and SEM, and used to obtain the 18 S rRNA gene sequence; molecular data was analyzed cladistically in conjunction with data from 42 additional species belonging to the near complete Macrodasyida taxonomic spectrum. Morphological analysis, while providing new information on taxonomically relevant traits (adhesive tubes, protonephridia and sensorial bristles), failed to detect elements of the male system, thus stressing the parthenogenetic nature of the Brazilian species. Phylogenetic analysis, carried out with ML, MP and Bayesian approaches, yielded topologies with strong nodal support and highly congruent with each other. Among the supported groups is the previously undocumented clade showing the alliance between Redudasys fornerise and Dactylopodola agadasys; other strongly sustained clades include the densely sampled families Thaumastodermatidae and Turbanellidae and most genera. A reconsideration of the morphological traits of Dactylopodola agadasys in light of the new information on Redudasys fornerise makes the alliance between these two taxa very likely. As a result, we create Anandrodasys gen. nov. to contain members of the previously described D. agadasys and erect Redudasyidae fam. nov. to reflect this novel relationship between Anandrodasys and Redudasys. From an ecological perspective, the derived position of Redudasys, which is deeply nested within the Macrodasyida clade, unequivocally demonstrates that invasion of freshwater by gastrotrichs has taken place at least twice, in contrast with the single event hypothesis recently put forward.

  • 29.
    Todaro, M. Antonio
    et al.
    Università di Modena and Reggio Emilia, Italy.
    Dal Zotto, Matteo
    Università di Modena and Reggio Emilia, Italy.
    Kånneby, Tobias
    Lillhagsskolan, Gävle.
    Hochberg, Rick
    Integrated data analysis allows the establishment of a new, cosmopolitan genus of marine Macrodasyida (Gastrotricha)2019In: Scientific Reports, E-ISSN 2045-2322, Vol. 9, no 1, article id 7989Article in journal (Refereed)
    Abstract [en]

    Macrodasyida (phylum Gastrotricha) comprises 365 species distributed across 34 genera and 10 families. However, current classification is under revision due to the contradictory results of molecular and morphological cladistic analyses. Studies aimed at bridging the gaps took advantage of supplementary assessments of poorly known species and particularly from observations of new taxa showing original traits that could help to identify plesiomorphic character states in these anatomically diverse micrometazoa. We follow this path by describing three new interesting macrodasyidan species respectively from Italy, Brazil and Sweden. In many respects, the new species resemble most closely species of the genus Macrodasys; however, details of the external morphology, in combination with the different lay-out of the reproductive system and the tiny spermatozoa lacking a visible flagellum, suggest they belong to a new genus, possibly in the family Macrodasyidae. These hypotheses are supported by the phylogenetic relationships of 47 taxa inferred from analyses of the 18S rRNA gene, which found the new species clustering with Thaidasys tongiorgii in a subset of a larger clade containing Macrodasys. Accordingly, the establishment of the following taxa is proposed: Kryptodasys gen. nov., K. marcocurinii sp. nov., K. carlosrochai sp. nov. and K. ulfjondeliusi sp. nov.

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  • 30.
    Todaro, M. Antonio
    et al.
    Department of Biology, University of Modena and Reggio Emilia, Modena, Italy.
    Kånneby, Tobias
    Department of Invertebrate Zoology, Swedish Museum of Natural History, Stockholm, Sweden.
    Dal Zotto, Matteo
    Department of Biology, University of Modena and Reggio Emilia, Modena, Italy.
    Jondelius, Ulf
    Department of Invertebrate Zoology, Swedish Museum of Natural History, Stockholm, Sweden.
    Phylogeny of Thaumastodermatidae (Gastrotricha: Macrodasyida) Inferred from Nuclear and Mitochondrial Sequence Data2011In: PLOS ONE, E-ISSN 1932-6203, Vol. 6, no 3, article id e17892Article in journal (Refereed)
    Abstract [en]

    Background

    Phylogenetic relationships within Gastrotricha are poorly known. Attempts to shed light on this subject using morphological traits have led to hypotheses lacking satisfactory statistical support; it seemed therefore that a different approach was needed.

    Methodology/Principal Findings

    In this paper we attempt to elucidate the relationships within the taxonomically vast family Thaumastodermatidae (Macrodasyida) using molecular sequence data. The study includes representatives of all the extant genera of the family and for the first time uses a multi-gene approach to infer evolutionary liaisons within Gastrotricha. The final data set comprises sequences of three genes (18S, 28S rDNA and COI mtDNA) from 41 species, including 29 thaumastodermatids, 11 non-thaumastodermatid macrodasyidans and a single chaetonotidan. Molecular data was analyzed as a combined set of 3 genes and as individual genes, using Bayesian and maximum likelihood approaches. Two different outgroups were used: Xenotrichula intermedia (Chaetonotida) and members of the putative basal Dactylopodola (Macrodasyida). Thaumastodermatidae and all other sampled macrodasyidan families were found monophyletic except for Cephalodasyidae. Within Thaumastodermatidae Diplodasyinae and Thaumastodermatinae are monophyletic and so are most genera. Oregodasys turns out to be the most basal group within Thaumastodermatinae in analyses of the concatenated data set as well as in analyses of the nuclear genes. Thaumastoderma appears as the sister taxon to the remaining species. Surprisingly, Tetranchyroderma is non-monophyletic in our analyses as one group of species clusters with Ptychostomella while another appears as the sister group of Pseudostomella.

    Conclusions/Significance

    Results in general agree with the current classification; however, a revision of the more derived thaumastodermatid taxa seems necessary. We also found that the ostensible COI sequences from several species do not conform to the general invertebrate or any other published mitochondrial genetic code; they may be mitochondrially derived nuclear genes (numts), or one or more modifications of the mitochondrial genetic code within Gastrotricha.

  • 31. Willems, Wim
    et al.
    Curini Galletti, Marco
    Ferrero, Tim
    Fontaneto, Diego
    Heiner, I.
    Huys, R.
    Ivanenko, V.
    Kristensen, Reinhardt
    Kånneby, Tobias
    Swedish Museum of Natural History.
    Macnaughton, Martin
    Martinez Arbizu, Pedro
    Todaro, M. Antonio
    Sterrer, Wolfgang
    Jondelius, Ulf
    Meiofauna of the Koster-area, results from a workshop at the Sven Lovén Centre for Marine Sciences (Tjärnö, Sweden)2009In: Meiofauna Marina, ISSN 1611-7557, Vol. 17, p. 1-34Article in journal (Refereed)
    Abstract [en]

    During a two-week workshop held at the Sven Lovén Centre for Marine Sciences on Tjärnö, an island on the Swedish west-coast, meiofauna was studied in a large variety of habitats using a wide range of sampling tech- niques. Almost 100 samples coming from littoral beaches, rock pools and different types of sublittoral sand- and mudflats yielded a total of 430 species, a conservative estimate. The main focus was on acoels, proseriate and rhabdocoel flatworms, rotifers, nematodes, gastrotrichs, copepods and some smaller taxa, like nemertodermatids, gnathostomulids, cycliophorans, dorvilleid polychaetes, priapulids, kinorhynchs, tardigrades and some other flatworms. As this is a preliminary report, some species still have to be positively identified and/or described, as 157 species were new for the Swedish fauna and 27 are possibly new to science. Each taxon is discussed separately and accompanied by a detailed species list.

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