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Statolith morphology of six Korean cephalopod species

한국산 두족류 6종의 이석 형태

Abstract

This study was investigated to statolith morphology, and examined applicability of the morphology to taxonomy the six Korean cephalopod species. The cephalopods used in the study were caught on the southern coast of Korea, and after transfer to the laboratory, statolith was extracted and observed. Observation results showed that the component parts of statolith were different between Octopoda and Decapoda consequently, it was possible to distinguish between Octopoda and Decapoda based on the statolith morphology. In Octopoda, the shape and location of the tip of the wing could be used as the taxonomic character. In Decapoda, Lateral dome and dorsal dome could be used for the taxonomic character. These morphological differences of statoliths are thought to be related to the ecology of each species.

keywords
Octopus vulgasris, Octopus minor, Amphioctopus fangsiao, Sepia esculenta, Loliolus japonica, Todarodes pacificus, Statolith

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