Cymonomus, A. Milne-Edwards, 1880

Ahyong, Shane T. & Ng, Peter K. L., 2017, Zavreliella undetermined, Zoological Studies (Zool. Stud.) 56 (24), pp. 1-20 : 19

Key to species of Cymonomus from East Asia

and the South China Sea

1. Carapace and pereopods covered with stalked, globose tubercles.... .................................................... C. curvirostris

- Carapace and pereopods with simple granules or tubercles, not stalked......................................................................... 2

2. Rostrum longer than eyestalks........................ C. japonicus

- Rostrum shorter than eyestalks......................................... 3

3. Pleotelson with demarcation between telson and somite 6 indicated by notches in lateral margins and transverse groove on surface (sometimes faint)................ C. cognatus

- Pleotelson lacking demarcation between telson and somite 6, neither with marginal notches nor transverse groove on surface............................................................................... 4

4. Rostrum distinctly shorter than outer orbital processes........ ............................. ............................................ C. hakuhoae

- Rostrum as long as or longer than outer orbital processes.. ........................................................................................... 5

5. Cheliped palm outer surface with long spines. Eyestalks subparallel, slightly movable............................. C. umitakae

- Cheliped palm outer surface with low tubercles or granules. Eyestalks divergent, immovable.... .................................... 6

6. Carapace anterolateral spines long, prominent C. deforgesi

- Carapace anterolateral spines low, inconspicuous............... ............................. ................................................... C. chani