HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences >
Peer-reviewed Journal Articles, etc >

Descriptions of the copepodid stages of the mesopelagic copepod, Gaetanus variabilis (Brodsky, 1950) (Calanoida, Aetideidae) from the Japan Sea

Files in This Item:
Yamaguchi-2005.pdf2.41 MBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/60646

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)

Submitter: 山口 篤

Export metadata:

OAI-PMH ( junii2 , jpcoar )


 

Feedback - Hokkaido University