Galil, 2001
The genus is distinguished from Arcania Leach, 1817 in having the basal antennular segment sealing antennular fossa, anterior margin of the efferent branchial channel medially fissured, the posterior margin of the carapace tridenticulate, the third to sixth segments of the male abdomen fused and bearing a preapical tubercle, and the first male pleopod distally expanded.
Type species: Arcania gracilipes Bell, 1855.
Species included:
Raylilia coniculifera Galil, 2001
Raylilia gracilipes (Bell, 1855)
Raylilia mirabilis (Zarenkov, 1969)
Raylilia uenoi (Takeda, 1995)