Hapalogaster
Hapalogaster is a genus of king crabs, containing the following four species:
| Image | Scientific name | Common name | Distribution |
| Hapalogaster cavicauda Stimpson, 1859 | West Coast of the United States | ||
| Hapalogaster dentata | Stone crab, spiny stone crab | Yellow Sea, Sea of Japan, coast of Mainland Japan | |
| Hapalogaster grebnitzkii Schalfeew, 1892 | |||
| Hapalogaster mertensii Brandt, 1850 |