Sperm ultrastructure in honeycomb (foam) oysters (Mollusca, Bivalvia, Gryphaeidae, Pycnodontinae): comparison with other Ostreoidea and taxonomic implications
Sperm ultrastructural features of the honeycomb (foam) oysters Hyotissa hyotis, H. sinensis, and H. mcgintyi (Gryphaeidae) are described and compared with other Ostreoidea and more generally with other pteriomorphian Bivalvia. Spermatozoa of H. sinensis and H. mcgintyi (the type species of Parahyoti...
Saved in:
Published in | Invertebrate biology Vol. 134; no. 2; pp. 136 - 150 |
---|---|
Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Hoboken
Allen Press
01.06.2015
Blackwell Publishing Ltd Wiley Subscription Services, Inc |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Sperm ultrastructural features of the honeycomb (foam) oysters Hyotissa hyotis, H. sinensis, and H. mcgintyi (Gryphaeidae) are described and compared with other Ostreoidea and more generally with other pteriomorphian Bivalvia. Spermatozoa of H. sinensis and H. mcgintyi (the type species of Parahyotissa Harry 1985) exhibit (1) a broad, low‐conical acrosomal vesicle; (2) subacrosomal material (very electron‐dense granular material and an almost electron‐lucent axial rod); (3) a spheroidal nucleus with a wide anterior invagination (filled with subacrosomal components); (4) a midpiece composed of four spherical mitochondria surrounding a pair of centrioles (rootlet associated with proximal centriole); and (5) a flagellum. Sperm of Hyotissa hyotis (type species of Hyotissa Stenzel 1971) differ markedly from those of H. sinensis and H. mcgintyi, in having (1) a conical acrosomal vesicle showing coarse granular texture anteriorly; (2) a very electron‐dense axial rod; (3) a barrel‐shaped nucleus with a long, narrow anterior invagination (filled with both subacrosomal components) and a basal invagination partly housing the proximal centriole; and (4) five midpiece mitochondria and no proximal centriolar rootlet. Results indicate that H. sinensis should be relocated to another genus, possibly a revised genus Parahyotissa, and also show that the sperm of H. sinensis and H. mcgintyi show many similarities to those of the Ostreidae, with the exception that the ‘axial rod’ component of the subacrosomal material is less electron‐dense than the surrounding substance (more dense in Ostreidae, as in H. hyotis). No family defining sperm features of the Gryphaeidae can be identified. |
---|---|
Bibliography: | http://dx.doi.org/10.1111/ivb.12086 ark:/67375/WNG-QZW5DZ8W-T U.S. National Science Foundation (NSF) - No. DEB-0732854 istex:E9228E2F2987A8ABE2EEF7BC6F31427199AE1A53 ArticleID:IVB12086 |
ISSN: | 1077-8306 1744-7410 |
DOI: | 10.1111/ivb.12086 |