A New Species of the Genus Stylactaria (Cnidaria, Hydrozoa) from Hokkaido, Japan(Systematics and Taxonomy)

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概要

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• A new species of athecate hydroid, Stylactaria multigranosi sp. Nov., is described based on specimens from Hokkaido, Japan. Of 416 colonies collected, all of the mature ones (N=306) were female. Hydroids of S. multigranosi were associated exclusively with a gastropod, Nassarius multigrano-sus (Dunker, 1847), living on sandy-mud bottoms. This new species is characterized by having fixed eumedusoid gonophores without marginal tentacles. Eggs in 5. Multigranosi develop into planulae within the gonophores. Four types of zooids (gastrozooids, normal gonozooids, non-hypostomed gonozooids and tentaculozooids) were discovered. The taxonomy of Stylactaria is briefly discussed, with particular reference to morphology of gonophores and intercolonial variation in zooid polymorphism.

• 社団法人日本動物学会の論文
• 1991-08-15

著者

• Namikawa H

  Nippon Sanso K.k. Kawasaki

• NAMIKAWA HIROSHI

  Zoological Institute, Faculty of Science, Hokkaido University

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• A New Species of the Genus Stylactaria (Cnidaria, Hydrozoa) from Hokkaido, Japan(Systematics and Taxonomy)

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