Sex Determination and Ontogeny in Malacochersus tornieri, the Pancake Tortoise

Michael A. Ewert; Ronnie E. Hatcher; J. Michael Goode

doi:10.1670/149-03N

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Michael A. Ewert,^1,* Ronnie E. Hatcher,² J. Michael Goode^2,**

¹aDepartment of Biology, 1001 East Third Street, Indiana University, Bloomington, Indiana, 47408-3700
²bColumbus Zoo, 9990 Riverside Drive, Box 400, Powell, Ohio 43065, USA

^*Corresponding Author. mewert@bio.indiana.edu
^**Deceased

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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Michael A. Ewert, Ronnie E. Hatcher, and J. Michael Goode "Sex Determination and Ontogeny in Malacochersus tornieri, the Pancake Tortoise," Journal of Herpetology 38(2), 291-295, (1 June 2004). https://doi.org/10.1670/149-03N

Accepted: 1 January 2004; Published: 1 June 2004

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