Reproductive biology of the Sword Snake Tomodon dorsatus (Serpentes: Dipsadidae) in South Brazil: comparisons within the tribe Tachymenini
2020
We described the reproductive cycle, size-fecundity
relationships, reproductive effort, and sexual maturity of Tomodon dorsatus in South Brazil. We examined 87 individuals (25
males and 62 females) from herpetological collections. The description of the reproductive
cycle was based on the morpho-anatomical and histological changes in male testes,
ductus deferens, and kidney and in female ovary and oviduct. The age at the
onset of sexual maturity was estimated by skeletochronology of the caudal
vertebra. The reproduction is seasonal semi-synchronous with most of the
individuals showing a reproductive peak in the spring. Males and females have developed
sperm storage strategies, increasing the reproductive success. Males store sperm
in the ductus deferens during the autumn and winter, while females storage takes
place in the utero-vaginal junction furrows during the autumn and early winter.
Larger females produce a higher number of larger follicles and eggs. Females
invest more in growth before reaching sexual maturity than males. Females reach
sexual maturity earlier (4 years old) than males (5 years old) and have larger
bodies but lower longevity. Reproductive strategies of Tachymenini specie are highly conserved.
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