NEW RECORDS OF 3 RARE BRACHYURAN CRABS FROM SINGAPORE SEAS (CRUSTACEA, DECAPODA, BRACHYURA, PARTHENOPIDAE, XANTHIDAE AND PILUMNIDAE)

Three rare and poorly known species of crabs are added to the Singapore Brachyuran fauna: Pseudolambrus bicornis (Flipse, 1930) (Parthenopidae MacLeay, 1838), Hypocolpus rugosus (Henderson, 1893) (Xanthidae MacLeay, 1838, s. str.) and Mertonia lanka Laurie, 1906 (Piluminidae Samouelle, 1819). Pseudolambrus bicornis has not been reported since its discovery in 1930 (type locality Java Sea), whilst Hypocolpus rugosus is not known outside Sri Lanka (= Ceylon). Mertonia lanka has a wide distribution in the Indo-West Pacific but has not been hitherto reported from the centre of the Sunda Shelf.