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• W2102628900 abstract "There are several kinds of anomalies related to the teeth reported in mammals, and one of them is known as supernumerary teeth and is commonly noticed in the literature, being reported in nearly all orders of mammals. Here, we report the occurrence of supernumerary molars in the sigmodontine rodent Necromys lasiurus, a common and widespread small rodent of tribe Akodontini. In order to assess the patterns of mor - phometric variation of N. lasiurus in eastern South America, we examined the skulls of 1763 specimens. The supernumerary molars were found in 2 individuals, which represent a frequency of 0.11%. The origin of super- numerary teeth started a long discussion on tooth homology, whether this anomaly is a result of heredity, a mutation or an atavism. Based on the morphologies presented by the extra teeth encountered in N. lasiurus and on the evidences and hypothesis available in the literature, we consider that the presence of these super- numerary molars in one of the studied animals could be considered an atavism, and we also consider the extra molar presented by the other specimen is a malformation, due to some kind of random process occurred in later stages of the development of distal dental germ. To the best of our knowledge, this represents the first record of supernumerary molars in the subfamily Sigmodontinae and one of the few known cases in rodents. RESUMO. Dentes supranumerarios em Necromys lasiurus (Rodentia, Cricetidae): primeiro registro em Sig- modontinae. Diversos tipos de anomalias dentarias ja foram descritas para mamiferos e uma delas e conhecida como dente supranumerario comumente reportada na literatura para quase todas as ordens de mamiferos. No presente trabalho apresentamos a ocorrencia de molares extras em Necromys lasiurus, uma especie de pequeno roedor sigmodontineo comum e amplamente distribuido, membro da tribo Akodontini. Durante o levantamento de dados para avaliacao morfometrica da variacao da especie no leste da America do Sul, foram examinados os crânios de 1763 especimes. Os dentes supranumerarios foram encontrados em dois individuos, representando 0.11% da amostra investigada. A ocorrencia dos dentes supranumerarios ha muito tempo levanta questoes acerca da ho- mologia dentaria, das mutacoes e dos atavismos que podem estar relacionados a origem desta anomalia. Baseados na morfologia apresentada pelos molares extra numerarios de N. lasiurus, nos consideramos que a presenca dos mesmos em um dos especimes e um atavismo, e no outro, trata-se de uma malformacao devido a um processo de origem tardia no desenvolvimento das gemas dentarias. Com base em nosso conhecimento de outras especies e em toda a revisao bibliografica, a ocorrencia dos dentes supranumerarios em N. lasiurus trata-se dos primeiros registros da anomalia para a subfamilia Sigmodontinae e um dos poucos ja registrados para a ordem Rodentia." @default.
• W2102628900 created "2016-06-24" @default.
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• W2102628900 date "2014-12-01" @default.
• W2102628900 modified "2023-09-26" @default.
• W2102628900 title "SUPERNUMERARY TEETH IN Necromys lasiurus (RODENTIA, CRICETIDAE): THE FIRST RECORD IN SIGMODONTINAE" @default.
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