Early Ontogeny of the Japanese Common Squid Todarodes pacificus (Cephalopoda, Ommastrephidae) with Special Reference to its Characteristic Morphology and Ecological Significance(Animal Diversity and Evolution)

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概要

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• Early ontogeny of the Japanese Common Squid Todarodes pacificus was described for artificially inseminated and collected specimens to present new criteria for developmental stages in relation to its ecological adaptation. For the purpose, details for formation of the following organs and tissues were observed with special attention : cilia on the integument, mouth part, shell sac and stellate ganglia, visceral mass, funnel-collar complex, statocysts, eye parts, and ventral photosensitive vesicles. At the embryonic stage (i. e., pre-hatching), various types of epidermal cilia that seem to work as the embryonic rotation were detected. At the early postembryonic stage (i. e., post-hatching), the epidermal lines were characteristically arranged at the scattered condition on arms, tentacles, head, and funnel. Novel strong muscle fibers were distinct in the base of tentacles and funnel retractor muscles at the early postembryonic stage, which is clearly related to the head withdrawal behavior of the paralarvae. The lip cilia and toothed beak developed at the early postembryonic stage, but disappeared later; these apparatus were considered to be related with a change of unique feeding mode in the paralarval life. Based on such morphological features, four distinct stages, namely, paralarval stage 1, 2, 3, and juvenile stage are proposed. The present observations are discussed in relation to survival strategy at early life of T. pacificus and they are compared with those in other oephalopods.

• 社団法人日本動物学会の論文
• 2001-09-20

著者

• GOTO T.

  Japan Steel Works, Ltd.

• Shigeno Shuichi

  Ushimado Marine Laboratory Graduate School Of Natural Science And Technology Okayama University

• Segawa Susumu

  Laboratory Of Invertebrate Zoology Tokyo University Of Fisheries

• Kidokoro H.

  Japan Sea National Fisheries Research Institute

• Tsuchiya K.

  Laboratory of Invertebrate Zoology, Tokyo University of Fisheries

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• Early Ontogeny of the Japanese Common Squid Todarodes pacificus (Cephalopoda, Ommastrephidae) with Special Reference to its Characteristic Morphology and Ecological Significance(Animal Diversity and Evolution)
• Mortality of the short-neck clam Ruditapes philippinarum induced by the toxic dinoflagellate Heterocapsa circularisquama

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