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Phylogenetic Position of Arctotanais in the Suborder Tanaidomorpha (Peracarida : Tanaidacea)

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Title: Phylogenetic Position of Arctotanais in the Suborder Tanaidomorpha (Peracarida : Tanaidacea)
Authors: Kakui, Keiichi Browse this author →KAKEN DB
Kajihara, Hiroshi Browse this author →KAKEN DB
Kobayashi, Norio Browse this author
Keywords: Arctotanais
molecular phylogeny
Issue Date: Jan-2012
Publisher: The Crustacean Society
Journal Title: Journal of Crustacean Biology
Volume: 32
Issue: 1
Start Page: 127
End Page: 139
Publisher DOI: 10.1163/193724011X615406
Abstract: Lack of an ischium on pereiopods 1–6 was previously considered a synapomorphy for the tanaidacean superfamily Tanaoidea, although descriptions of Arctotanais alascensis (Richardson, 1899), the sole species in Arctotanais, indicated presence or absence of the ischium. To resolve this ambiguity, we examined newly collected specimens of A. alascensis (including males, which had not previously been described) from Hokkaido, Japan, using light and scanning electron microscopy. We also conducted molecular phylogenetic analyses based on partial sequences of the 18S rRNA gene to examine the phylogenetic position of A. alascensis. Here we describe in detail the morphology of the male of A. alascensis, which proved to be similar to that of the females. This species bears an ischium on pereiopods 1–6, which contradicts the current diagnoses of Tanaoidea and Tanaidae, although other synapomorphies remain valid. Molecular phylogenetic analyses strongly supported the placement of A. alascensis in Tanaoidea, and consequently we amended the diagnoses for Tanaoidea and Tanaidae to include either presence or absence of the ischium on the pereiopods.
Rights: This is a pre-copyedited, author-produced version of an article accepted for publication in Journal of Crustacean Biology following peer review. The version of record Journal of Crustacean Biology 32(1):127-139. 2012 is available online at:
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 角井 敬知

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