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- W1460629319 abstract "Abstract. The morphology of some deciduous teeth of Arctotherium tarijense Ameghino and A. angustidens Gervais and Ameghino (Ursidae: Tremarctinae) is here described and compared for the first time. The crown morphology of dP4 and dp4 is similar to that of M1 and m1. The general morphology of dP/dp4b in A. tarijense and Ursinae is similar, but their permanent dentition morphology is different. The dP/dp4 of A. tarijense seem to bear a generalized set of characters (i.e. crown outline, the protocone and parastyle of dP4, the metaconid and hypoconid of dp4); unfortunately these teeth cannot be compared with their homologues in other tremarctines. Consequently, we are unable to include these characters in the phylogenetic analysis of the Tremarctinae subfamily in order to know whether the phylogenetic relationships are affected or not. It is interesting to note, that had these characters been present in M/m1 of A. tarijense, at least, some of them could be undoubtedly regarded as plesiomorphic features. In this respect, is the deciduous teeth morphology more conservative than that of permanent teeth?Resumen. MORFOLOGIA DE LOS DIENTES DECIDUOS DE ALGUNOS TREMACTINOS (URSIDAE, T REMARCTINAE).DESCRIPCIONES, COMPARACIONES Y POSIBLES IMPLICANCIAS FILOGENETICAS. Se describe y compara la morfologia de algunos dientes deciduos de Arctotherium tarijense Ameghino and A. angustidens Gervais and Ameghino (Ursidae, Tremarctinae) por primera vez. La morfologia del dP4 y dp4 es muy similar a la del M1 y m1. La morfologia general de los dP/dp4 en A. tarijense y Ursinae es similar, aunque la morfologia de sus dientes definitivos es muy diferente. Los dP/dp4 de A. tarijense parecen poseer un conjunto de caracteres generalizados (en relacion con el contorno de la corona, el protocono y el parastilo del dP4, el metaconido y el hipoconido del dp4). Desgraciadamente no es posible comparar esas piezas con sus homologas en otros tremarctinos, por lo que no es posible incluir estos caracteres en el analisis filogenetico de la subfamilia Tremarctinae con el fin de saber si sus relaciones filogeneticas se ven afectadas o no. Es importante remarcar que si esos carcateres estuviesen presentes en los M/m1 de A. tarijense, al menos algunos de ellos podrian ser interpretados como plesiomorfias. En este sentido, ?la morfologia de los dientes deciduos es mas conservadora que la de los definitivos?" @default.
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- W1460629319 date "2004-01-01" @default.
- W1460629319 modified "2023-09-26" @default.
- W1460629319 title "Deciduous teeth morphology of some tremarctines (Ursidae, Tremarctinae). Descriptions, comparisons and possible phylogenetic implications" @default.
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