Ultrastructure of sperm development and mature sperm morphology in three species of commensal bivalves (Mollusca: Galeommatoidea) Export

@article{citeulike:4880212, abstract = {Ultrastructural features of the ovotestes, spermatogenesis, and the mature sperm are described for three galeommatid bivalves, Divariscintilla yoyo, Divariscintilla troglodytes, and Scintilla sp., from stomatopod burrows in eastern Florida. All three species yielded similar results except with respect to mature sperm dimensions. The ovotestis contains three types of somatic cells within the testicular portion: flattened myoepithelial cells defining the outer acinal wall; underlying pleomorphic follicle cells containing abundant glycogen deposits; and scattered, amoeboid cells containing lysosomal-like inclusions which are closely associated with developing sperm. Early spermatogenesis is typical of that reported from other bivalves. In contrast, the late stages of spermiogenesis involve the migration and gradual rotation of the acrosomal vesicle, resulting in a mature acrosome tilted about 70° from the long axis of the cell. The mature sperm possesses an elongated, slightly curved nucleus; a subterminal, concave acrosome with a nipple-like central projection; five spherical mitochondria and two centnoles in the middlepiece; and a long flagellum. The rotational asymmetry and the presence of perimitochondrial glycogen deposits in these sperm are unusual in the Bivalvia and may be associated with fertilization specializations and larval brooding common among galeommatoideans.}, address = {Reproductive Biology Program Harbor Branch Oceanographic Institution, Fort Pierce, Florida 34946; Indian River Coastal Zone Museum Harbor Branch Oceanographic Institution, Fort Pierce, Florida 34946; Department of Malacology, Delaware Museum of Natural History, Wilmington Delaware 19807}, author = {Eckelbarger, Kevin J. and Bieler, R\"{u}diger and Mikkelsen, Paula M.}, citeulike-article-id = {4880212}, citeulike-linkout-0 = {http://dx.doi.org/10.1002/jmor.1052050107}, citeulike-linkout-1 = {http://www3.interscience.wiley.com/cgi-bin/abstract/109917893/ABSTRACT}, doi = {10.1002/jmor.1052050107}, journal = {Journal of Morphology}, keywords = {invertebrate, met, mollusc, reproduction, spermatogenesis, spermatozoa}, number = {1}, pages = {63--75}, posted-at = {2009-06-17 13:56:58}, priority = {0}, title = {Ultrastructure of sperm development and mature sperm morphology in three species of commensal bivalves (Mollusca: Galeommatoidea)}, url = {http://dx.doi.org/10.1002/jmor.1052050107}, volume = {205}, year = {1990} }

TY - JOUR ID - citeulike:4880212 L3 - citeulike-article-id:4880212 N2 - Ultrastructural features of the ovotestes, spermatogenesis, and the mature sperm are described for three galeommatid bivalves, Divariscintilla yoyo, Divariscintilla troglodytes, and Scintilla sp., from stomatopod burrows in eastern Florida. All three species yielded similar results except with respect to mature sperm dimensions. The ovotestis contains three types of somatic cells within the testicular portion: flattened myoepithelial cells defining the outer acinal wall; underlying pleomorphic follicle cells containing abundant glycogen deposits; and scattered, amoeboid cells containing lysosomal-like inclusions which are closely associated with developing sperm. Early spermatogenesis is typical of that reported from other bivalves. In contrast, the late stages of spermiogenesis involve the migration and gradual rotation of the acrosomal vesicle, resulting in a mature acrosome tilted about 70° from the long axis of the cell. The mature sperm possesses an elongated, slightly curved nucleus; a subterminal, concave acrosome with a nipple-like central projection; five spherical mitochondria and two centnoles in the middlepiece; and a long flagellum. The rotational asymmetry and the presence of perimitochondrial glycogen deposits in these sperm are unusual in the Bivalvia and may be associated with fertilization specializations and larval brooding common among galeommatoideans. IS - 1 JF - Journal of Morphology AD - Reproductive Biology Program Harbor Branch Oceanographic Institution, Fort Pierce, Florida 34946; Indian River Coastal Zone Museum Harbor Branch Oceanographic Institution, Fort Pierce, Florida 34946; Department of Malacology, Delaware Museum of Natural History, Wilmington Delaware 19807 EP - 75 TI - Ultrastructure of sperm development and mature sperm morphology in three species of commensal bivalves (Mollusca: Galeommatoidea) VL - 205 SP - 63 KW - invertebrate KW - met KW - mollusc KW - reproduction KW - spermatogenesis KW - spermatozoa AU - Eckelbarger, Kevin AU - Bieler, Rüdiger AU - Mikkelsen, Paula PY - 1990/// UR - http://dx.doi.org/10.1002/jmor.1052050107 ER -