Varunidae, Milne-Edwards, 1853

Wicksten, Mary K., 2012, Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces 3371, Zootaxa 3371, pp. 1-307 : 264

Key to species of family Varunidae

1. Carapace about as long as wide, frontal margin toothed, outer margin of chelipeds setose. Introduced into San Francisco Bay area.................................................................................. Eriocheir sinensis

– Carapace considerably more broad than long, frontal margin without teeth, outer margin of chelipeds not setose. Widespread, native.............................................................................................. 2

2. Pereopods 2–5 setose. Front with deep median sinus. Chelae not spotted with red or purple....... Hemigrapsus oregonensis

– Pereopods 2–5 not setose. Front somewhat sinuous. Chelae spotted with red or purple................ Hemigrapsus nudus