|
1
|
Buckland-Nicks JA, Fields AH. Genesis and structure of eusperm and parasperm of Plicopurpura patula in relation to phylogeny of Neogastropoda: proteomics of parasperm suggests role in paternity assurance. INVERTEBR REPROD DEV 2020. [DOI: 10.1080/07924259.2019.1695681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
| | - Angela H. Fields
- Department of Biological and Chemical Sciences, University of West Indies, Bridgetown, Barbados
| |
Collapse
|
|
2
|
Walker GK, Edwards CA, Black MG. Comparative morphology of zebra (Dreissena polymorpha) and quagga (Dreissena bugensis) mussel sperm: light and electron microscopy. CAN J ZOOL 1996. [DOI: 10.1139/z96-093] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Adult zebra (Dreissena polymorpha) and quagga (Dreissena bugensis) mussels were induced to release large quantities of live spermatozoa by the administration of 5-hydroxytryptamine (serotonin). Sperm were photographed alive using phase-contrast microscopy and were fixed subsequently with glutaraldehyde followed by osmium tetroxide for eventual examination by transmission or scanning electron microscopy. The sperm of both genera are of the ect-aquasperm type. Their overall dimensions and shape allow for easy discrimination at the light and scanning electron microscopy level. Transmission electron microscopy of the cells reveals a barrel-shaped nucleus in zebra mussel sperm and an elongated nucleus in quagga mussel sperm. In both species, an acrosome is cradled in a nuclear fossa. The ultrastructure of the acrosome and axial body, however, is distinctive for each species. The structures of the midpiece are shown, including a unique mitochondrial "skirt" that includes densely packed parallel cristae and extends in a narrow sheet from the mitochondria.
Collapse
|
|
3
|
|
|
4
|
Spermiogenesis in Polyplacophora, with special reference to acrosome formation (Mollusca). ZOOMORPHOLOGY 1990. [DOI: 10.1007/bf00312469] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|