Genus Ithyomus Bird, 2004

Diagnosis (modified after Bird 2004). Female/neuter. Anarthrurid with well-developed pleon. Labrum large and conical, not laterally compressed. Mandible without molar or lacinia mobilis. Maxillule endite with seven terminal spiniform setae. Maxilliped endite with one long seta. Cheliped carpus with two robust ventral setae, propodus without lateral fold but with inner row of large robust setae at dactylus insertion; fixed finger with two robust ventral setae, dactylus with long dorsal seta. Pereopod 4–6 merus with two- and carpus with four- spiniform setae with complex apex. Pleopod exopod with setae on entire ventral and distal margin. Uropod exopod shorter than endopod article 1, with three setae and flat apex; endopod with two articles, first article at least twice as long as second.

Male unknown.