to extensive levels of sperm competition. The males of this species tend to have an arm girth that is greater than female arm girth. The Crinia georgiana also have vomerine teeth. It is one of the only frogs within Myobatrachidae that have a variable note number. Size Females are usually 30–36 mm, while males most often range from 24 to 32 mm, although the smallest calling males can be as small as 20 mm. Although the difference in size between males and females is not significant enough to constitute dimorphism, there is an unusually large variation in size of males in this species, which may be attributed to pressures of sexual selection. When tadpoles hatch, they tend to be 7 mm from snout to tail and can reach 20.5 mm prior to metamorphosis.) Population structure, speciation, and phylogeny Phylogeny and close relatives There has been debate regarding the placement of species in the Crinia genus. Due to the distinctiveness of Crinia georgiana, the other species within the group were organized as either C. signifera or C. insignifera. The Crinia georgiana does not form a distinct clade from other Crinia species. The sister group of the Crinia clade containing Crinia georgiana is the clade containing C. parinsignifera, with a difference at one branch. The clade containing C. georgiana, C. insignifera, C. glauerti, C. sloanei, C. subinsignifera, and C. pseudinsignifera; this means that C. georgiana is a sister taxon to five other Crinia species. The presence of vomerine teeth is one of the features used in the classification and differentiation of Crinia georgiana from other species. Based on calculations from the genetic distance and immunological distance, the divergence of C. signifera to C. georgiana is 6 million years, with the possibility of the divergence occurring due to exploitation of drier habitats. Etymology Quacking frogs are also called red-thighed froglets. Quacking frogs were first located near Albany; thus, they were named after King George Sound. Habitat and distribution Habitat Because water is essential to this species, it is confined to areas of the coastal plains and forests where water is abundant particularly in winter, when breeding occurs. It is often found in shallow water near sandstone settlements or in marshy bogs. In addition, the quacking frog is known to live amongst vegetation or in habitats that result from the activity of humans such as agricultural lands and rural gardens where water is likely