オーストンフクロウニ(Araeosoma owstoni)の巨大精子

概要

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The structure of the spermatozoon of a soft-shelled sea urchin, Araeosoma owstoni, was studied comparatively with the sperm of Anthocidaris crassispina and Hemicentrotus pulcherrimus, using ordinary dark field, and electron microscopy. With dark field, it was observed that the Araeosoma spermatozoon has a much longer head and a slightly longer flagellum than the sperm of Hemicentrotus. Electron microscopical studies revealed that the unusual length of the Araeosoma sperm head is due not to the length of the acrosome or other structures, but to the length and peculiar formation of the nucleus itself. The basal end of the nucleus of Araeosoma juts out posteriorly, whereas in Anthocidaris it is invaginated to surround the centriole at the base of the flagellum. Only one doughnut-like nitochondrion encircles the jutting part of the nucleus. The diameter of the Araeosoma flagellum is the same as that of Anthocidaris.
社団法人日本動物学会の論文
1974-09-25