Greenfield's mudbrotula (Dermatopsis greenfieldi) is a ray-finned fish of the family Dinematichthyidae. It inhabits marine (saltwater) waters in reef-associated environments. This species can reach a maximum total length of 5.3 cm. It occurs at depths between 1 and 10 metres. With a trophic level of 3.2, it is a low-level carnivore, feeding on invertebrates and small organisms. It is assessed as Least Concern on the IUCN Red List.
Dorsal soft rays (total): 64 - 70; Anal soft rays: 44 - 49; Vertebrae: 39 - 41. This species is characterized by the following: vertebrae 11-12 + 27-29 = 39-41, dorsal fin rays 64-70, anal fin rays 44-49; body with scales; eye 1.8-2.6 % SL, sharp spine on ventral maxilla positioned behind rear tip of eye; otolith with pointed posterior tip and weak postdorsal angle, it is elongate, length to height ratio 2.1-2.2, sulcus with separated colliculi ; large, broad single pair of (outer) pseudoclaspers, inwardly connected to isthmus with ligament, and has 2 supporters, the anterior inclined, short, joined at base to massive and long posterior supporter .: elongated.
Behavioural data for Greenfield's mudbrotula is currently being reviewed.
Marine; reef-associated; depth range 1 - 10 m . Tropical Central Pacific: Fiji.
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