Two species have been described from the Indian Ocean: C. apus Lloyd 1909a and C. flammeus Le Danois
1979 (originally a subspecies of C. umbrinus Gilbert 1905), both of which are confirmed to be valid in the present
study. Smith in Smith & Heemstra (1986) recorded C. penicillatus McCulloch 1915 and C. pictus from South
Africa; the latter is confirmed to be a misidentification from our examination. Although C. umbrinus has also been
listed from the Indian Ocean, these records need to be verified.