Adault sex

The evolutionary history of sexual selection in the geologic past is poorly documented based on quantification, largely because of difficulty in sexing fossil specimens. Even such essential ecological parameters as adult sex ratio ASR and sexual size dimorphism SSD are rarely quantified, despite their implications for sexual selection. To enable their estimation, we propose a method for unbiased sex identification based on sexual shape dimorphism, using size-independent principal components of phenotypic data. We applied the method to test sexual selection in Keichousaurus hui, a Middle Triassic about Ma sauropterygian with an unusually large sample size for a fossil reptile.
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Adult sex ratio, sexual dimorphism and sexual selection in a Mesozoic reptile.

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