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American Zoologist 1975 15(3):553-565; doi:10.1093/icb/15.3.553
© 1975 by The Society for Integrative and Comparative Biology
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Comparative Morphology of Echinoderm Sperm and Possible Phylogenetic Implications

FU-SHIANG CHIA, DAVID ATWOOD and BRUCE CRAWFORD
Department of Zoology, University of Alberta Edmonton, Alberta, Canada T6G 2E1

The sperm morphology of at least 7 crinoids, 11 ophiuroids, 23 asteroids, 23 holothuroids, and 37 echinoids is known. For all the known crinoids, ophiuroids, and asteroids, the sperm are spherical, while those of echinoids are conical. Holothuroid sperm are basically spherical, with two exceptions: cylindrical in Cucumaria lubrica and tabloid in Cucumaria pseudocurata. The possible implications of sperm morphology in the mode of fertilization and in echinoderm phylogeny are discussed.


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