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Ansrnrcr. The external morphology of Gopherus agasszli is sexually dimorphic with characteristics of the plastron useful for determining gender. However, these characteristics are associated with male secondary sexual characteristics, females being identified by the lack of such features, and therefore are less useful for assessing gender in young tortoises. We investigated whether these and other external characteristics could be used for determining gender of small tortoises by measuring 22 external characteristics on 105 tortoises (carapace length 5L299 mm) and analyzing these data using discriminant function analysis. The discriminant models were capable of unambiguously assigning gender to individuals as small as L40 mm carapace length, and by plotting the discriminant scores on carapace length, the model could be used to predict possible gender of even smaller tortoises.

SEXING YOUNG, FREE-RANGING DESERT TORTOISES (GOPHERUS AGASSIZII) USING EXTERNAL MORPHOLOGY