Ctenocheles Kishinouye 1926

Genus Ctenocheles Kishinouye, 1926 Ctenocheles Kishinouye, 1926: 36 (type species: Ctenocheles balssi Kishinouye, 1926, by original designation and monotypy).— Holthuis 1967: 377.—de Saint Laurent 1973: 514.— Poore & Griffin 1979: 277.—de Saint Laurent & Le Loeuff 1979: 81–83.— Manning & Felder 1991: 784.— Sakai 1999: 88.— Davie 2002: 464.— Sakai 2005: 237–238.— Sakai 2011: 486– 487 (key to species).— Hyžný et al. 2014: 249–250.— Poore & Dworschak 2017: 122 (synonymy).— Poore et al. 2019: 118–119.— Poore & Ahyong 2023: 199–200. Tosacallianassa Sakai, 2016: 813 (type species: Tosacallianassa hatasagaensis Sakai, 2016, by original designation and monotypy). Remarks. For the most recent diagnoses of Ctenocheles Kishinouye, 1926, see Poore et al. (2019) and Poore & Ahyong (2023). Distributions and depths ranges of species are given in Table 2. Ctenocheles differs from Ctenocheloides Anker, 2010, the only other axiidean genus with elongate, pectinate cheliped fingers, by: (1) the presence of an acute, projecting rostrum; (2) the small and poorly pigmented corneas; (3) the longer fingers of the major cheliped (≥ 1.5 times the length of palm); (4) the longer and sharper teeth on the cutting edges of the major cheliped; (5) the truncate posterior margin of telson; and (6) the presence of a notch on the distal margin of the uropodal exopod (except for Ctenocheles plantei (Burukovsky, 2005)). Besides, Ctenocheloides inhabits shallower water (less than 15 m, usually 1–1.5 m) than Ctenocheles (deeper than 10 m, up to 800 m) (Matsuzawa & Hayashi 1997; Anker & Pachelle 2013; Poore 2015), which might explain why it has well-developed corneas.