Pseudamiops diaphanes are 2 inches long.[2] The body is very elongated.[3] This species is transparent and has a dusky lip.[3] The caudal peduncle is lengthy as the caudal fin is rhomboid.[3] On the base of the caudal fin they have a faint dark bar that goes across.[3] They have cycloid scales that are thin and shed easily.[3] They lack a lateral line and a supramaxilla.[3] They have a bony process that points down to the back of the maxilla.[3] The preopercular edge is serrated and the ridge is smooth.[3]
Pseudamiops diaphanes stay in dark holes during the day and come up at night to feed on zooplankton.[4]
^Gosline, A (1960). Handbook of Hawaiian Fishes. University of Hawaii Press.
^ abcdefghRandall, John E. (2007). Reef and shore fishes of the Hawaiian Islands. University of Hawaii at Manoa. Honolulu: Sea Grant College Program, University of Hawaiʻi. ISBN978-1-929054-03-9.
