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Vol. 49 No. 2, 2010
Ultrastructure of Spermatozoa of Prionospio japonica
(Annelida: Spionidae) from Taiwan
Vasily
I. Radashevsky1,*, Arkadiy A. Reunov1, Olga V. Yurchenko1, Yana N.
Alexandrova1, and Hwey-Lian Hsieh2
1A.V. Zhirmunsky Institute of Marine Biology, Far Eastern Branch of the
Russian Academy of Sciences, Vladivostok 690041, Russia
2Biodiversity Research Center,
Academia Sinica, Nankang, Taipei 115, Taiwan
Vasily I. Radashevsky, Arkadiy A. Reunov, Olga V. Yurchenko, Yana N. Alexandrova, and Hwey-Lian Hsieh (2010)
Prionospio japonica, a common inhabitant of estuaries in the
northwestern Pacific Ocean, releases gametes into the water, where
fertilization and planktotrophic larval development occur. Each
spermatozoon has a biradially symmetrical acrosome 0.3 ± 0.1 μm long, a
spherical nucleus 1.7 ± 0.2 μm in diameter, 4 spherical mitochondria
0.8 ± 0.1 μm in diameter, 2 centrioles situated perpendicular to each
other, and a flagellum with a 9 × 2 + 2 organization of
microtubules. The biradially symmetrical acrosome, which is also
present in P. cf. queenslandica, is unique among polychaetes examined
to date and possibly an apomorphy shared by a group of closely related
Prionospio species.
Key words: Sperm, Morphology, Polychaeta.
*Correspondence: E-mail:radashevsky@mail.ru
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