A phylogenetic approach to species delimitation in freshwater Gastrotricha from Sweden

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 , Lepidocha...

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Bibliographic Details
Published in:Hydrobiologia 2012-03, Vol.683 (1), p.185-202
Main Authors: Kånneby, Tobias, Todaro, M. Antonio, Jondelius, Ulf
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal populations
Animal, plant and microbial ecology
Aquatic ecology
Aquatic life
Aquatic organisms
Biological and medical sciences
Biomedical and Life Sciences
Chaetonotidae
Cryptic species
Diversity of life
Ecology
Freshwater & Marine Ecology
Freshwater fauna
Fundamental and applied biological sciences. Psychology
Gastrotricha
General aspects
Heterolepidoderma ocellatum
Invertebrates
Lepidodermella
Life Sciences
Livets mångfald
New species
Phylogenetics
Phylogeny
Population genetics
Primary Research Paper
Speciation
Squamata
Synecology
Systematic Zoology
Taxonomic revisions
zoologisk systematik och evolutionsforskning
Zoology
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Description
Summary: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, under the name H. acidophilum n. sp. Moreover, genetic data based on COI indicate large 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 article, the new species, Lepidodermella intermedia n. sp., from northern Sweden is also described. The phylogenetic hypothesis generated shows that Chaetonotidae is a non-monophyletic group.
ISSN:0018-8158
1573-5117
1573-5117
DOI:10.1007/s10750-011-0956-1