The carpal elements of anurans
FABREZI, MARISSA; ALBERCH, PERE
The Herpetologists' League, Inc.
Lugar: Kansas; Año: 1996 p. 188 - 204
The available information on the identity of the embryonic and adult cartilaginous elements of the anuran carpus is limited, often confusing, and sometimes contradictory. Based on a comparative study of complete ontogenetic series of seven anuran species (representing three families), we map some of the diversity encountered in the ontogeny of the anuran carpus and propose an updated general scheme of homologies. Elements are identified by observation of the spatial patterns of early chondrogenic condensations. We report the presence of an element that differentiates in association with the ulnare and propose it to be homologous to the intermedium of tetrapods. An unusual preaxial element that forms in the vicinity of the radiale is described. The absence of centralia in the anuran carpus is confirmed. Based on our analysis, we propose a unified nomenclature for skeletal elements of the anuran carpus. Key words: Limb; Hand; Carpus; Development; Anuran; Amphibian; Evolution; Homology