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Hokkaido University Collection of Scholarly and Academic Papers >
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Descriptions of the copepodid stages of the mesopelagic copepod, Gaetanus variabilis (Brodsky, 1950) (Calanoida, Aetideidae) from the Japan Sea
| Title: | Descriptions of the copepodid stages of the mesopelagic copepod, Gaetanus variabilis (Brodsky, 1950) (Calanoida, Aetideidae) from the Japan Sea |
| Authors: | Yamaguchi, Atsushi Browse this author →KAKEN DB | | Ikeda, Tsutomu Browse this author →KAKEN DB | | Hirakawa, Kazumasa Browse this author | | Tachibana, Shizuka Browse this author |
| Issue Date: | 2005 |
| Publisher: | Brill Academic Publishers |
| Journal Title: | Crustaceana |
| Volume: | 78 |
| Issue: | 7 |
| Start Page: | 819 |
| End Page: | 837 |
| Publisher DOI: | 10.1163/156854005774445447 |
| Abstract: | Based on specimens collected from the Japan Sea, all copepodid stages of the mesopelagic copepod, Gaetanus variabilis are described and illustrated. Among the family Aetideidae, the development of the body segmentation and of the segmentation of the swimming legs in G. variabilis is more similar to that in Gaetanus kruppii than to that in Aetideopsis armata, Chiridius gracilis, or Euchirella messinensis. A sharp, spine-like crest on the frontal dorsal surface of the cephalothorax is a characteristic feature of copepodid stages II-IV of G. variabilis. This frontal crest of G. variabilis, lost in copepodid stages V-VI, is considered as “convergent morphology”, relative to G. kruppii. Nucleotide sequences of the mitochondrial 16S rRNA gene confirmed that copepodid stages II and III with frontal crest and copepodid stage VI without frontal crest are the same species: Gaetanus variabilis. In the adult male, the mandible, maxillule, and maxilla degenerate, whence no feeding takes place: a phenomenon commonly seen in aetideid copepods. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/60646 |
| Appears in Collections: | 水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 山口 篤
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