Raphidopus Stimpson, 1858

Osawa, Masayuki & Ng, Peter K. L., 2018, A new species of the genus Raphidopus Stimpson, 1858 (Crustacea: Decapoda: Anomura: Porcellanidae) from Peninsular Malaysia, with additional records of R. johnsoni Ng & Nakasone, 1994 from Southeast Asia, and a key to species in the genus, Zootaxa 4433 (1), pp. 111-126 : 125

Key to species of the genus Raphidopus Stimpson, 1858

1. Branchial margins of carapace each with 1–3 distinct spines on median part.................. R. ciliatus Stimpson, 1858

- Branchial margins of carapace without spines................................................................ 2

2. Carpi of chelipeds each with 3 or 4 sharp spines on distal third of posterior margin.... R. persicus Ng, Safaie & Naser, 2012

- Carpi of chelipeds unarmed on posterior margins............................................................. 3

3. Carpus of each cheliped usually with blunt longitudinal ridge on midline of dorsal surface. Dactylus of larger cheliped with 2 distinct proximal teeth on cutting edge. Ambulatory legs comparatively stout (in fourth pereopod, 2.4–2.6 and 2.2–2.4 times longer than high on merus and propodus, respectively).......................................... R. brevipes n. sp.

- Carpus of each cheliped without blunt longitudinal ridges on midline of dorsal surface. Dactylus of larger cheliped with 1 distinct proximal tooth on cutting edge. Ambulatory legs slender (in fourth pereopod, 2.8–3.1 and 2.7–3.0 times longer than high on merus and propodus, respectively)...................................................................... 4

4. Eyes comparatively large, reaching lateral limits of orbits. Dactylus of larger cheliped with distinct, blunt tooth on median part of cutting edge, in addition to 1 proximal tooth................................... R. johnsoni Ng & Nakasone, 1994

- Eyes small, not reaching lateral limits of orbits. Dactylus of larger cheliped without prominent tooth on median part of cutting edge........................................................................... R. indicus Henderson, 1893