1997•CrustaceanaRequires access

On Two New Species of Freshwater Crabs of the Genera Sayamia and Heterothelphusa (Brachyura, Parathelphusidae) From Southern Thailand

Peter K. L. Ng

Abstract

Abstract Two new species of freshwater crabs of the family Parathelphusidae are described from southern Thailand. Sayamia melanodactylus sp. nov. is one of the smallest members of the genus known, and seems to be most closely related to S. sexpunctata, but differing in carapace and male gonopod characters as well as in the colour of the fingers of its minor chelae (black against brown). Heterothelphusa fatum sp. nov. is related to H. insolita from nearby northeastern Peninsular Malaysia, but has a distinctly more swollen carapace, proportionately more slender ambulatory legs and a very differently structured major male chela.

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Key concepts: Chela, Carapace, Freshwater crab, Gonopod, Carcinology, Biology, Decapoda, Genus