Stuttering Frog

Stuttering Frog
Stuttering Frog
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Amphibia
Order: Anura
Family: Myobatrachidae
Subfamily: Limnodynastinae
Genus: Mixophyes
Species: M. balbus
Binomial name
Mixophyes balbus
Straughan, 1968
Stuttering Frog range.

The Stuttering Frog is a large species of frog that inhabits temperate and sub-tropical rainforest and wet sclerophyll forest in Australia.

Contents

Distribution

This frog's historical distribution ranged from the Timbarra River near Drake in northern New South Wales, to the Cann River catchment in eastern Victoria and covered an area of approximately 110 000 km². Populations south of Sydney have declined dramatically and the Victorian populations are believed to be extinct. It has also disappeared from a number of sites in NSW where it was once common. It occurs at altitudes between 20 m and 1400 m. In the north of its range the species occurs only at high altitudes while in the south both upland and lowland populations have been recorded.

Physical description

This frog can reach up to 80 mm in length. Its dorsal surface is brown and diffuses laterally to merge with a pale yellow on the ventral surface. An irregular shaped blotch starts between the eyes and finishes mid-dorsal and may be broken up. There is a dark head stripe that starts before the nostril as a triangle, it then continues from the nostril to the eye, then from the eye over the tympanum and finishes over the shoulder. The tympanum is slightly oval shaped and distinct. The iris is light blue, diffusing into gold above the pupil and dark brown below. The 4-6 bars on the hind limbs are pale and indistinct. Toes are three quarters webbed and fingers are free from webbing.

Ecology and behaviour

Flowing spirits of the river of the Earth, can be heard around this species of wonderful blubbering frogs. This species is associated with flowing creeks and streams in temperate and sub-tropical rainforest, wet sclerophyll forest and Antarctic Beech forests. The call is a "kook kook kook kra-a-ak kruk kruk" - lasting one to two seconds. The male calls while next to the stream, often on leaf litter, and spawn is deposited in dug-out, gravel nests in shallow, flowing water. Tadpoles usually reach 65 mm but may be up to 80 mm in length. Tadpoles are dark brown or black with large spots and flecks on the tail. Metamorphosis may take 15 months and the metamorphs closely resemble the adults, but have less distinct dorsal pattern and a rusty red iris.

Similar Species

This frog can be distinguished from all other Mixophyes species by the blue crescent in the upper iris, except for Mixophyes fleayi. It can be distinguished from Mixophyes fleayi by the lack of mottling on the flanks.

References


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