| 1 | The foot is bright orange | Onchidium stuxbergi (known distribution: Peninsular Malaysia, Thailand (Gulf of Thailand), Vietnam, eastern Borneo, Philippines, southernmost tropical China). |
| – | The foot is not bright orange | 2 |
| 2 | The hyponotum is white and the foot is whitish | Onchidium reevesii (known distribution: subtropical China, from 22°30’ to 34°36’) |
| – | The hyponotum (and the foot) is not white but varies between grayish and yellowish, and sometimes even greenish | Onchidium typhae (known distribution: Bengal, Andaman Islands, Malaysia, Singapore). |
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