Diplonotos costulatus is recorded from the Pacific. The SEMs are of the paratype specimen, USNM 8503, by courtesy of Dennis Gordon and NIWA. Originally published in Gordon (1988), NZ Journal of Zoology.
Original description: Diplonotos costulatus Canu & Bassler, 1930.
Locality: Galapagos
Type specimen: Holotype USNM8502, Albatross Stn 2813; Paratype USNM8503, Albatross Stn D3408.