Scylla olivacea (Herbst, 1796)

Scylla olivacea (Herbst, 1796) View in CoL # ( Fig. 37A–C View Fig )

Scylla olivacea — present record.

Taxonomy: Serène (1952), Keenan et al. (1998), Ng (1998), Yang et al. (2012).

Type: Neotype ò QM W20895 (designated by Keenan et al. (1998).

Type locality: Kupang, Indonesia (neotype).

Distribution: Central or eastern Indian Ocean to West Pacific: Pakistan, northwestern and northern Australia, Southeast and East Asia to southern China and southwestern Taiwan ( Keenan et al. 1998).

Habitat: Intertidal to shallow subtidal; associated with mangrove forests inundated with reduced salinity seawater during wet season ( Keenan et al. 1998).

Remarks: The present species is distinguished from the locally common S. paramamosain Estampador, 1949 by the rounded instead of acute frontal lobes, and chela nearly entirely rusty reddish (instead of patches of orange on cream-colored background in S. paramamosain ). See Remarks under S. serrata below. This species is a new record for the fauna of Hong Kong.

Scylla paramamosain Estampador, 1949 View in CoL #

Scylla paramamosain View in CoL — Keenan et al. 1998: 232, figs. 7C, 8C, 9C, 13; Keenan 1999: 54, fig. 3; B Chan and Leung 2002: 24; Yam et al. 2002: 18; Fong et al. 2005: 64, 4 unnumb. figs.; Wong et al. 2021: 40, fig. 72, pl. 14B; Bravo et al. 2021: tab. 2.

Scylla serrata View in CoL — SY Lee and Leung 1999: 75, pl. 19; Tam and Wong 2000: 119, 2 unnumb. figs.; Leung et al. 2004: 101, 1 unnumb. fig. [not Cancer serrata Forskål, 1775 ].

Taxonomy: Serène (1952), Keenan et al. (1998), Ng (1998), Yang et al. (2012).

Type: Neotype ò QM W22174 (designated by Keenan et al. 1998).

Type locality: Timbulsloko, Central Java, Indonesia (neotype).

Distribution: West Pacific: Indonesia to Singapore, Cambodia, Vietnam, South China, Taiwan and Japan ( Keenan et al. 1998).

Habitat: Intertidal to subtidal; associated with shallow reef rubble, subtidal flats and estuarine pools, or in mangrove forests ( Keenan et al. 1998).

Remarks: Records of Scylla species from Hong Kong likely or shown to represent S. paramamosain are listed above. This species is not uncommon in mangrove habitats (“gei wai” included), and occasionally obtained by trawls from shallow estuarine seas. See remarks under S. serrata below.