Echidnocerus is a genus of king crab. It includes Echidnocerus foraminatus (the brown box crab) and Echidnocerus cibarius, the Puget Sound king crab. The genus was long known as Lopholithodes until it was discovered in 2022 that Lopholithodes is a junior synonym of Echidnocerus.
Echidnocerus contains the following two species: