Key to species of Xenograpsus

1. Epigastric tubercles not arranged in cristae; many large protogastric tubercles ............ X. ngatama sp. nov.

- Epigastric cristae well developed; single prominent protogastric tubercle ................................................. 2

2. Single anterolateral tooth; cervical groove well marked X. novaeinsularis Takeda & Kurata, 1977 (Japan)

- No anterolateral teeth; cervical groove not well marked............................................................................... .......................................................................................... X. testudinatus Ng, Huang & Ho, 2000 (Taiwan)