| Abstract: | 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 a flagellum. We also documented the release of spermatozeugmata in two additional unionid species, Lampsilis cardium and Amblema plicata plicata. |
| Genre: | Article |
| ProdID: | 1002879 |
| Citation Author: | Waller, D. L.; Lasee, B. A. |
| Citation Contributing Office: | Upper Midwest Environmental Sciences Center |
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| Citation End Page: | 223 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | American Midland Naturalist |
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| Citation Number Of Pages: | 4 |
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| Citation Phsyical Description: | pp. 220-223 |
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| Citation Publisher: | U.S. Geological Survey |
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| Citation Search Results Text: | 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. |
| Citation Start Page: | 220 |
| Citation Volume: | 138 |
| Citation Year: | 1997 |
| Type: | citation/reference |
| Text: | 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. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1997 00:00 -0600 |
| Publisher: | U.S. Geological Survey |
