The anuran tarsus
International Society for the Study and Conservation of Amphibians
Lugar: Paris; Año: 1993 p. 47 - 63
The structure of the tarsus in adult specimens and larval sequences in different families of anurans are analyzed, in order to establish an overall concept of the diversity of this character in the group. Ontogenetic analysis has made it possible to confirm the hypothesis of the origination of distal tarsals and metatarsals along the fibular axis, whereas the element Y and the prehallux originate along the tibial axis, with not differentiation into intermedium and Centralia. On the basis of ontogenetic information, it can be established that the plesiomorphic condition of the tarsus in anurans is that in which the ends of the tibiale and fibulare are fused, and there are three free distal tarsals, the element Y and the prehallux. Apomorphic states can be recognized by different types of fusion between proximal and distal elements, or by a reduction of distal elements.