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Sperm transfer and storage in the lizard, Anolis carolinensis
1Departments of Biology and Psychology and Social Relations, Harvard University, Cambridge, Massachusetts 02138.
Journal of Morphology
|September 6, 2018
Summary
In Anolis carolinensis, the hemipenis interacts with the cloaca during mating, facilitating sperm transport. Sperm are stored in specialized tubules within the female reproductive tract after insemination.
Area of Science:
- Reproductive Biology
- Herpetology
- Comparative Anatomy
Background:
- Understanding reproductive mechanisms in Anolis carolinensis is crucial for evolutionary studies.
- Previous research has not fully elucidated the details of sperm transfer and storage in this species.
Purpose of the Study:
- To investigate the relationship between the hemipenis and cloaca during copulation in Anolis carolinensis.
- To examine sperm storage and transport within the female oviduct following mating.
Main Methods:
- Light microscopy
- Scanning electron microscopy (SEM)
- Histological analysis of reproductive tissues
Main Results:
- The hemipenis does not penetrate the cloaca; instead, sperm delivery occurs via the sulcus spermaticus apposing oviduct openings.
- Sperm storage tubules (SSTs) within the utero-vaginal transition receive sperm 2-6 hours post-insemination.
- Sperm reach the infundibulum 6-24 hours after mating, indicating a delayed transport mechanism.
Conclusions:
- The hemipenile-cloacal interaction is specialized for efficient sperm deposition.
- Sperm storage in the oviduct plays a significant role in the reproductive strategy and life history of Anolis carolinensis.
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