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In the year 2006, monitoring on Rhinoclemmys nasuta was carried out in six small streams in a continental insular zone on the Colombian Pacific coast (Palma Island) with the aim of evaluating the intrapopulational morphometric variation. Three hundred thirty-three tortoises were captured and 10 body measurements were recorded for each individual: length of the shell, maximum length of the shell, width of the shell, maximum width of the shell, length of the plastron, maximum length of the plastron, height of the shell, bridge length, pre-cloaca tail length and post-cloaca tail length with measures for females, males and young of 178.7 mm, 134.0 mm and 125.5mm, respectively. Significant morphometric differences were detected among R. nasuta female, male and young from Palma Island. Nevertheless, no significant differences were detected among the small streams studied. From the 10 morphological variables selected for the development of this study, the pre-cloacal tail length explained 84.23% of variation between females and males; accordingly the use of this measurement is proposed as appropriate for distinguishing the sex in R. nasuta, ruling out the total length of the tail for this purpose.

revista colombiana de ciencia animal recia

Evaluación morfométrica y dimorfismo sexual intra-poblacional de rhinoclemmys nasuta (boulenger, 1902) en una zona insular continental del pacifico colombiano