The Ranoidea are a superfamily of frogs in the order Anura. These frogs have a fused pectoral girdle bone in their chests, no ribs, and the males hold on to the female with an axillary grip during mating. The tadpoles have a single spiracle on the left side and complex mouthparts. Some species do not have tadpoles, and small frogs grow straight from eggs. Scientists disagree about exactly which frogs should be placed in which family and on exactly where Ranoidea belongs among groups of amphibians. Amphibian scientists often change their minds about exactly which frogs are related to each other and how closely, usually when someone finds new information (Glaw,Vences, 2001).