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Cophixalus saxatilis

Black Mountain Boulder Frog

Conservation Status

EPBC:

Unlisted

IUCN:

Vulnerable

Calling Period

Possible
Yes
Peak
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Description

A medium-sized species of frog reaching up to nearly 5 cm in body length. It has a grey or pale yellow back, with dark brown mottling. There is a dark brown horizontal stripe between the eyes, a dark brown W-shaped marking on the upper back, and pale yellow eye-spots on the lower back. There is often a dark brown stripe from the nostril to behind the eye. The eyelids are white or yellow. The belly is pale yellow. The pupil is horizontal and the iris is gold. The groin and back of the thighs are orange. Fingers and toes are unwebbed, both with large discs. In contrast to the male, females are uniform bright yellow except for the groin and back of the thighs, which are the same colour as the male's.

Breeding Biology

Eggs are laid on land as a small cluster connected by a thin jelly string under rocks. The nest is guarded by the male, as it is with other Cophixalus species. Tadpoles never swim in water; instead they develop entirely inside the egg and hatch as little frogs. It is unknown how long they take to develop into frogs, but Cophixalus ornatus eggs have been recorded taking 28 days to hatch. Breeds during spring to summer after rain.

Similar Species

Does not look similar to any other species in its distribution.

Images

Photo: Shane Black

Photo: Shane Black

Photo: Shane Black

Photo: Scott Eipper

Calls

By: Keith McDonald

By: Justin McMahon

Distribution

Found only in the Black Trevethan Range near Cooktown in northern QLD.

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