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DESCRIPTIONS OF THE COPEPODID STAGES OF THE MESOPELAGIC COPEPOD, GAETANUS VARIABILIS (BRODSKY, 1950) (CALANOIDA, AETIDEIDAE) FROM THE JAPAN SEA BY ATSUSHI YAMAGUCHI 1,3 ) , SHIZUKA TACHIBANA 1 ) , KAZUMASA HIRAKAWA 2 ) and TSUTOMU IKEDA 1 ) 1 ) Laboratory of Marine Biodiversity, Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minatomachi, Hakodate, Hokkaido 041-8611, Japan 2 ) Hokkaido National Fishery Research Institute, 116 Katsurakoi, Kushiro, Hokkaido 085-0802, Japan 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
Crustaceana – Brill
Published: Jan 1, 2005
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