Sex Determination and Ontogeny in Malacochersus tornieri, the Pancake Tortoise
Michael A. Ewert, Ronnie E. Hatcher, J. Michael Goode
Abstract
Michael A. Ewert, Ronnie E. Hatcher, J. Michael Goode
Abstract
We document temperature-dependent sex determination (TSD) in the Pancake Tortoise (Malacochersus tornieri). The nesting season is biased toward a fall–winter pattern and the embryos have a postovipositional developmental arrest. Males initially grow faster than females, but females are the larger sex. The species does not readily conform to a hypothesis that TSD is adaptively maintained through a direct association of juvenile growth with adult sexual size dimorphism.
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We document temperature-dependent sex determination (TSD) in the Pancake Tortoise (Malacochersus tornieri). The nesting season is biased toward a fall–winter pattern and the embryos have a postovipositional developmental arrest. Males initially grow faster than females, but females are the larger sex. The species does not readily conform to a hypothesis that TSD is adaptively maintained through a direct association of juvenile growth with adult sexual size dimorphism.
Key concepts: Biology, Tortoise, Sexual dimorphism, Ontogeny, Juvenile, Zoology, Sexual maturity, Sexual differentiation