Oncopagurus, Lemaitre, 1996

Lemaitre, Rafael, 2014, A worldwide taxonomic and distributional synthesis of the genus Oncopagurus Lemaitre, 1996 (Crustacea: Decapoda: Anomura: Parapaguridae), with descriptions of nine new species, Raffles Bulletin of Zoology 62, pp. 210-301 : 214

Key to the eastern Pacific species of Oncopagurus

1. Antennal acicle not exceeding distal margin of cornea, reaching at most to about proximal margin of cornea; right cheliped with dorsal surface of carpus and chela armed with numerous distinct spines or tubercles; left cheliped with carpus armed with irregular row of small sharp spines on dorsal margin; male with paired first gonopods, and with symmetrical second gonopods................................................................... O. crusoei

– Antennal acicle distinctly exceeding distal margin of cornea by 0.3 to 0.5 length of acicle; right cheliped with dorsal surfaces of carpus and chela at most with scattered small spines or tubercles (sometimes arranged medially in irregular rows); left cheliped with carpus lacking spines dorsally except for dorsodistal spine; male lacking first gonopods, and with asymmetrical second gonopods.................................................................... O. haigae