1	Tines of sternal furca widely separated	2
–	Tines of sternal furca originating close together	9
2	Outermost spine of terminal exopod segment of leg 1 reduced or absent	3
–	Outermost spine of terminal exopod segment of leg 1 developed	4
3	Outermost spine of terminal exopod segment of leg 1 reduced	C. pseudorhombi
–	Outermost spine of terminal exopod segment of leg 1 absent	C. xystercus
4	Maxillipedal corpus with triangular process at mid-length	C. pterois
	Maxillipedal corpus without distinct process	5
5	Tines of sternal furca with truncate tips	6
–	Tines of sternal furca with pointed tips	7
6	First segment of antenna with sharply pointed posterior process	C. pectinatus
–	First segment of antenna with bluntly pointed posterior process	C. similis
–	First segment of antenna with spatulate posterior process	C. nuenonnae
7	Tines of sternal furca swollen at mid-length	C. kajii sp. nov.
–	Tines of sternal furca tapering distally	8
8	Gap between tines narrower than length of tine	C. bifurcus
–	Gap between tines wider than length of tine	C. musaicus
9	Maxillipedal corpus with conical process midway	10
–	Maxillipedal corpus without distinct process	11
10	Genital complex as long as wide	C. dieuzeidei
–	Genital complex wider than long	C. priacanthi
11	Postantennal process with accessory process basally	C. hobsoni
–	Postantennal process without accessory process	12
12	Genital complex more than twice as long as abdomen	13
–	Genital complex about 1.4 times longer than abdomen	C. ligatus
–	Genital complex about 1.7 times longer than abdomen	C. longirostris
13	First segment of antenna with spatulate posterior process (spine)	C. buechlerae
–	First segment of antenna with pointed posterior process (spine)	14
14	Tines of sternal furca short, thick, about 1.6 times as long as wide	C. latigenitalis
–	Tines of sternal furca long, slender, about 2.7 times as long as wide	C. olsoni