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Reproduction in the night snake, Hypsiglena torquata (Serpentes: Colubridae), from Arizona



Reproduction in the night snake, Hypsiglena torquata (Serpentes: Colubridae), from Arizona



Texas Journal of Science 53(2): 107-114



Reproductive tissue was examined from 109 sexually mature Hypsiglena torquata museum specimens from Arizona. Males follow a seasonal testicular cycle with sperm produced April to September. The prolonged period of sperm production suggests a similarity to testicular cycles of some tropical snakes. Sperm was present in the vasa deferentia from April to September indicating H. torquata has the potential for breeding throughout this period. Male H. torquata reach sexual maturity at a smaller size than females. Females with enlarged follicles ([>] 12 mm length) or oviductal eggs were found April to August. There was no evidence that more than one clutch of eggs is produced during the same breeding season. Mean clutch size for nine females was 3.2 [plus or minus] 1.5 SD, range = 2-6.

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Accession: 011286156

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