SPERMATOGENESIS AND SPERM STRUCTURE OF THE NORMALLY PARTHENOGENETIC FRESHWATER SNAIL MELANOIDES TUBERCOLATA
In: Israel Journal of Ecology and EvolutionSearch for other papers by ALAN N. HODGSON in
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The freshwater snail Melanoides tuberculata ranges throughout Asia and Africa, and throughout much of its range it reproduces parthenogenetically. In Israel, however, males have been found. These males produce two types of spermatozoa, euspermatozoa and paraspermatozoa. The euspermatozoa are filiform (about 230 μ m in length) with a head comprising a nucleus and conical acrosome, a mid-piece (98 μ m long) of four equal-sized mitochondria, and a tail. Unlike in other cerithiaceans, the nucleus is unusually elongate (31 μ m long × 1 μ m diameter) and the axoneme is housed within an intranuclear canal. The paraspermatozoa consists of a head of electron-dense blocks (up to 25 μ m long) which surround up to 15 axonemes, a mid-piece of elongate mitochondria and a tail tuft, as in other cerithiaceans. Structural changes during spermatogenesis resemble those described for other gastropods with dimorphic spermatozoa.
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SPERMATOGENESIS AND SPERM STRUCTURE OF THE NORMALLY PARTHENOGENETIC FRESHWATER SNAIL MELANOIDES TUBERCOLATA
In: Israel Journal of Ecology and EvolutionSearch for other papers by ALAN N. HODGSON in
Current site
Google Scholar
PubMed
Search for other papers by JOSEPH HELLER in
Current site
Google Scholar
PubMed
The freshwater snail Melanoides tuberculata ranges throughout Asia and Africa, and throughout much of its range it reproduces parthenogenetically. In Israel, however, males have been found. These males produce two types of spermatozoa, euspermatozoa and paraspermatozoa. The euspermatozoa are filiform (about 230 μ m in length) with a head comprising a nucleus and conical acrosome, a mid-piece (98 μ m long) of four equal-sized mitochondria, and a tail. Unlike in other cerithiaceans, the nucleus is unusually elongate (31 μ m long × 1 μ m diameter) and the axoneme is housed within an intranuclear canal. The paraspermatozoa consists of a head of electron-dense blocks (up to 25 μ m long) which surround up to 15 axonemes, a mid-piece of elongate mitochondria and a tail tuft, as in other cerithiaceans. Structural changes during spermatogenesis resemble those described for other gastropods with dimorphic spermatozoa.
| All Time | Past 365 days | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 205 | 40 | 17 |
| Full Text Views | 10 | 0 | 0 |
| PDF Views & Downloads | 4 | 0 | 0 |
