Spermatozoon Ultrastructure of Two Holothurian Species of the Genus Cucumaria (Dendrochirotida, Holothuroidea) from the Sea of Japan

Spermatozoon Ultrastructure of Two Holothurian Species of the Genus Cucumaria (Dendrochirotida,... The ultrastructure of spermatozoa of Cucumaria japonica and a congeneric morphologically similar deep-sea species was studied. The spermatozoa of both C. japonica and C. conicospermium are similar to those of other holothurians: the acrosome is composed of an acrosomal granule and periacrosomal material; the centrioles lie at an acute angle to one another; and the proximal centriole is connected to the nuclear envelope by a flagellar rootlet. The spermatozoa of C. japonica differ from those of C. conicospermium in the shape of the head and the dimensions and position of the acrosome. In C. japonica, the acrosome is completely embedded in the nuclear fossa and measures 0.7 μm. In C. conicospermium, only one-third of the acrosome is embedded in the nuclear fossa; this acrosome measures 1.3 μm. A correlation between the structure of the sperm acrosome and that of the egg envelope is discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

Spermatozoon Ultrastructure of Two Holothurian Species of the Genus Cucumaria (Dendrochirotida, Holothuroidea) from the Sea of Japan

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Publisher
Springer Journals
Copyright
Copyright © 2002 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Freshwater & Marine Ecology
ISSN
1063-0740
eISSN
1608-3377
D.O.I.
10.1023/A:1014437832678
Publisher site
See Article on Publisher Site

Abstract

The ultrastructure of spermatozoa of Cucumaria japonica and a congeneric morphologically similar deep-sea species was studied. The spermatozoa of both C. japonica and C. conicospermium are similar to those of other holothurians: the acrosome is composed of an acrosomal granule and periacrosomal material; the centrioles lie at an acute angle to one another; and the proximal centriole is connected to the nuclear envelope by a flagellar rootlet. The spermatozoa of C. japonica differ from those of C. conicospermium in the shape of the head and the dimensions and position of the acrosome. In C. japonica, the acrosome is completely embedded in the nuclear fossa and measures 0.7 μm. In C. conicospermium, only one-third of the acrosome is embedded in the nuclear fossa; this acrosome measures 1.3 μm. A correlation between the structure of the sperm acrosome and that of the egg envelope is discussed.

Journal

Russian Journal of Marine BiologySpringer Journals

Published: Oct 13, 2004

References

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