Crossodonthina

Key to Crossodonthina with 3+3 eyes

1 Macrochaetae on terga smooth and pointed................................................................ 2

- Macrochaetae on terga sheathed and blunt, or serrated........................................................ 5

2 Tubercle Di on Th. II–Abd. IV reduced, represented by some chaetae........................................... 3

- Tubercle Di on Th. II–Abd. IV well defined................................................................ 4

3 Cephalic tubercle Dl, L and So separated, tubercle De on Th. II with 1 chaetae................. C. nipponica Yosii, 1954

- Cephalic tubercle Dl, L and So fused, tubercle De on Th. II with 2 chaetae................ C. koreana Yosii & Lee, 1963

4 Cephalic tubercle Dl, L and So fused, mandible with 1 basal tooth.......................... C. formosana Yosii, 1965

- Cephalic tubercle Dl, L and So independent, mandible with 3 basal tooth........................ C. acuminata sp. nov.

5 Tubercle Di on Th. II–Abd. IV reduced, represented by some chaetae, no chaetae present on furcular remnant........................................................................................... altamontana Yoshii, 1981

- Tubercle Di on Th. II–Abd. IV well defined, at least 2 chaetae present on furcular remnant........................... 6

6 Tubercle Oc with 2 chaetae, tubercle Di, De, Dl on Th. I with 3, 2, 3 chaetae respectively......... C. radiata Salmon, 1941

- Tubercle Oc with 3 chaetae, tubercle Di, De, Dl on Th. I with 1, 2, 1 chaetae respectively............................ 7

7 Cephalic tubercle Dl separate from L and So, tubercle De on Th. II with 5 (4+s) chaetae............................. 8

- Cephalic tubercle Dl fused to L and So, tubercle De on Th. II with 4 (3+s) chaetae................................ 10

8 Cephalic tubercle L separate from So, mandible with 2 basal teeth......................... C. alatoserrata Yosii, 1965

- Cephalic tubercle L fused to So, mandible with at least 3 basal teeth............................................. 9

9 Mandible with 3 rami and five fine basal teeth........................... C. tiantongshana Xiong, Chen & Ying, 2005

- Mandible with 5 rami and 3 big basal teeth......................................... C. choui Jiang & Zhang, 2012

10 Cephalic tubercle Oc with 2 short macrochaetae and 1 long macrochaeta, mandible with 3 basal teeth and 4 rami, maxilla with 3 lamellae and one of them fringed............................................... C. tridentiens Yue & Yin, 1999

- Cephalic tubercle Oc with 1 microchaeta, 1 mesochaeta and 1 macrochaeta, mandible with 4 basal teeth and 5 rami, maxilla with 2 lamellae and none of them fringed................................................... C. clavata sp. nov.