01482nas a2200169   4500008004100000245004800041210004800089260000800137300001000145490000800155520101700163653002001180653001301200100002101213700002401234856005401258       2003                        eng d00aParallelism and convergence in anuran fangs0 aParallelism and convergence in anuran fangs  cMay  a41-510 v2603 aThe anuran lower jaw is composed of three pairs of bones: dentaries, angulosplenials and mentomeckelians. Although the lower jaw is toothless, except in Gastrotheca guentheri, enlarged fangs or odontoids have evolved at least four times independently in some myobatrachids, hylids, ranids and leptodactylids through both parallel and convergent evolutionary events. Fangs seem to represent the single best design solution to enable an anuran to inflict a bite-like wound, but the biological role of biting varies among species. Fangs are projections of the dentaries in ranids, but in the hylid frog Hemiphractus and in ceratophryine leptodactylids, they form a sinosteotic unit with the dentaries and mentomeckelians. Comparisons of morphology, behaviour and diet among frog taxa with enlarged fangs reveal that the fangs may be the result of either sexual or natural selection. Those fangs that evolved in response to sexual selection seem to be relatively larger than those that resulted of natural selection.10aDimorphognathus10aodotoids1 aFabrezi, Marissa1 aEmerson, Sharon, B.  uhttps://africanamphibians.myspecies.info/node/321