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Family Calappidae
Key to genera and species
[Based on Williams, 19841
Family Calappidae 465
1. Chelae dissimilar; large tooth on dactylus and pair of protuberances on propodus of
major chela 2
Chelae essentially symmetrical, no unusually enlarged teeth or protuberances 4
2. (1) Posterolateral region of carapace expanded into dentate, winglike projection
. Calappa
Posterolateral region of carapace not expanded into dentate, winglike projection.... 3
3. (2) Merus of cheliped with very long, outstanding spine Acanthocarpus
Merus of cheliped without long spine; carapace subcircular, small spine at lateral
angle Cycloes bairdii
4. (1) Carapace considerably broader than long, regularly convex above Hepatus
Carapace nearly as long as broad, dorsal surface uneven Osachila
Genus Acanthocarpus Stimpson, 1871
Key to species
[Adapted from Rathbun, 1937]
Carapace narrowing in posterior half; short spine on posterolateral margin
A. alexandri
Carapace subcircular; long spine on posterolateral margin A. bispinosus