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External morphology of spermatozoa and spermatozeugmata of the freshwater mussel Truncilla truncata (Mollusca: Bivalvia: Unionidae)

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External morphology of spermatozoa and spermatozeugmata of the freshwater mussel Truncilla truncata (Mollusca: Bivalvia: Unionidae); 1997; Article; Journal; American Midland Naturalist; Waller, D. L.; Lasee, B. A.

Summary

Truncilla truncata males release spherical aggregates of spermatozoa, called spermatozeugmata, at spawning. Sperm aggregates from other bivalve species have been described, but few detailed studies exist of the morphology of unionid spermatozeugmata and spermatozoa. We provide the first description of the external morphology of spermatozeugmata and spermatozoa of T. Truncata. The spermatozeugmata had an inside diameter of 76 mu m and contained 8000-9000 spermatozoa. Heads of spermatozoa were directed toward the center of the sphere into a translucent shell; tails were arranged radially and caused the spermatozeugmata to rotate. Spermatozoa of T. Truncata measured 3.3 mu m in length (excluding tail) and each had a head, a midpiece and [...]

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  • Upper Midwest Environmental Sciences Center (UMESC)

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Harvested on Mon Jul 21 12:15:56 MDT 2014 from MODS XML Service

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Type Scheme Key
local-index unknown 1002879
local-pk unknown 1002879
series unknown American Midland Naturalist

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journalAmerican Midland Naturalist
parts
typevolume
value138
typeissue
value1
languageEnglish
citationTypeArticle

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