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The epidermal plates of the carapace and plastron of 51 adults (38 females and 13 males), 07 immature individuals, and 46 hatchlings of the freshwater turtle Trachemys dorbigni (Durémil & Bibron, 1835), originated from the delta of Rio Jacuí region, Rio Grande do Sul state, Brazil, were examined. The results showed that 7.7% of males, 10.52% of females, 14.28% of immature individuals, and 6.52% of the hatchlings presented a kind of anomaly on the shell, as well as a presence of supernumerary epidermal shields. Although the modification in the number of epidermal shields presents a high frequency in Testudines, these are the first descriptions of the variation in the pattern of carapacial scutation in eleven individuals from a population of T. dorbigni. The association of several environmental factors acting on the embryonic development of the individual may be responsible for the alteration of the pattern of carapacial scutation in this species. Os escudos epidérmicos da carapaça e do plastrão de 51 adultos (38 fêmeas e 13 machos), 07 imaturos e 46 filhotes da tartaruga de água doce Trachemys dorbigni (Durémil & Bibron, 1835), procedentes da região do delta do Rio Jacuí, Rio Grande do Sul, Brasil, foram examinados. Desta análise, 7,7% dos machos, 10,52% das fêmeas, 14,28% dos imaturos e 6,52% dos filhotes apresentaram algum tipo de anomalia no casco, bem como presença de escudos epidérmicos supernumerários. Embora a alteração no número dos escudos epidérmicos seja relativamente freqüente em Testudines, estas são as primeiras descrições de variação no padrão de escutelação em onze indivíduos de uma população de T. dorbigni. A associação de diferentes fatores ambientais, interagindo sobre o desenvolvimento embrionário do indivíduo, parece ser a responsável pela alteração do padrão de escutelação nessa espécie

Supernumerary epidermal shields and carapace variation in Orbigny's slider turtles, Trachemys dorbigni (Testudines, Emydidae)