Thomson's toothless frog

Sphenophryne thomsoni can grow to 38 mm (1.5 in) in snout–vent length. It is an extremely broad-bodied frog, with the rather flattened head that is as wide or nearly as wide as the body. The fingers are stubby and have no discs. The first toe is extremely short; the other toes are longer and bear small, grooved discs. The snout is rounded. No true teeth are present. The eyes are small. The tympanum is barely visible. Weak supratympanic folds are present. Another pair of more or less distinct skin folds starts near the eyes, converge in the scapular region, and then diverge and fade out. Preserved specimens are dorsally gray to light tan. A dark mark above the posterior edge of the tympanum is usually present, sometimes continuing anteriorly as an ill-defined postocular streak. The dorsal skin folds are accented by dark pigment; symmetrically placed small dark spots are present elsewhere on the dorsum. The ventral surfaces are pale and immaculate.

Sphenophryne thomsoni occurs on forest floor in primary tropical rainforests at elevations below 500 m (1,600 ft). Some specimens were found calling at night during light rain. Development is direct (i.e., there is no free-living larval stage). It is a very abundant species that is not believed to face significant threats—its use on Tagula Island for magic is not occurring at levels that would pose a threat. This species is present in the Kamiali Wildlife Management Area.

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