An asymmetric dental formula in a mammal, the São Tome Island fruit bat Myonycteris brachycephala (Mammalia: Megachiroptera)

The dental formula in heterodont mammals characteristically shows bilateral symmetry. Its expression is likely to be subject to very strong selective pressures, since it is associated with such basic functions as the acquisition and preparation of food. Here we report the exceptional finding of the...

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Bibliographic Details
Authors: Juste, Javier, Ibáñez, Carlos
Format: article
Publication Date:1993
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/48798
Online Access:http://hdl.handle.net/10261/48798
Access Level:Open access
Description
Summary:The dental formula in heterodont mammals characteristically shows bilateral symmetry. Its expression is likely to be subject to very strong selective pressures, since it is associated with such basic functions as the acquisition and preparation of food. Here we report the exceptional finding of the first asymmetric dental formula in a heterodont mammal observed in the São Tome Island (West Africa) frugivorous bat Myonycteris brachycephala. The asymmetry results from the absence of a lower internal incisor, occurring variably in the right or left mandible. This morphological innovation is possibly related to a developmental instability associated with the colonization by the island species