Evolução craniana em Trinomys yonenagae (Rodentia : Echimyidae) : analise geometrica no contexto de uma filogenia molecular

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

The skull of a monophyletic lineage of the genus Trinomys that includes the species T. yonenagae is viewed in this study under the paradigm of complex morphological structures whose final shape results from the interaction of several component parts. Under this paradigm, shape can be modeled at the morphogenetic level as localized variation at different geometric scales. Skull shape variation among the five species of Trinomys, for the dorsal, ventral, and lateral views of the skull, was investigated comparatively using the geometric formalism of the thin-plate spline functions to describe the organization of skull shape in terms of the geometric scale of shape differences. The results demonstrated that the information content of skull shape in the lineage that includes T. yonenagae can vary with respect to the molecular phylogenetic structure in the different levels of organizational complexity represented by the dorsal, ventral, and lateral views of the skull. The results also showed that there is a natural scale of variation in skull shape, which is commensurate with the molecular hierarchical variation of mitochondrial cytochrome b gene. Principal component analysis of the partial warps showed that, only for the lateral view of the skul1 and for the localized components of shape at small geometric scales (a = -1), the patter of morphological differentiation is commensurate with the independent phylogenetic hypothesis inferred from the sequences of the cytochrome b gene for the lineage of Trinomys that includes T. yonenagae

ASSUNTO(S)

cranio - evolução camundongo - filogenia morfologia (biologia)

ACESSO AO ARTIGO

Documentos Relacionados