Hephaestus habbemai, the mountain grunter, is a species of freshwater ray-finned fish, a grunter from the family Terapontidae. It is found in New Guinea.Allen, G.R., 1991. Field guide to the freshwater fishes of New Guinea. Publication, no. 9. 268 p. Christensen Research Institute, Madang, Papua New Guinea.
Habitat The adult fish inhabit the cobble and gravel bottom streams and the deep pools below rapids and waterfalls.
Breeding behavior The males guard and fan the eggs.
Size This species reaches a length of .
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