Roboastra gracilis (Bergh, 1877)

(Figure 24 G)

Material examined. Eight specimens. MB28-004556, ZRP, 0 3 Jun. 2012, 2 m, 22mm; MB28-0 0 4557, ZRP, 0 3 Jun. 2012, 2 m, 18mm, collected by A. Roseblum; MB28-004593, ZJS, 23 Jun. 2012, 8 m, 12mm, collected by A. Roseblum; MB28-004762, VISP, 12 Aug. 2013, 2 m, 12mm; MB28-00 4763, VISP, 12 Aug. 2013, 2 m, 14mm; MB28-004764, VISP, 12 Aug. 2013, 2 m, 13mm; MHN-YT987, VISP, 12 Aug. 2013, 2 m, 5mm; MB28-004876, NHR, 29 May 2014, 6m, 19mm.

Habitats. Subtropical tidal reefs, rocky reefs and tropical coral reefs. Often found under rocks.

Occurrences. Zavora, Nuarro and Vamizi Island.

Geographic distribution. Indo-west, central Pacific. Hawaii, Marshall Islands, Palau (Pola et al. 2005b), Guam (Carlson & Hoff 2003), Japan (Baba 1949), Solomon Islands, Thailand (Debelius 1996), Papua New Guinea, Australia (Pola et al. 2005b), Indonesia (Debelius 1996; Yonow 2011), Philippines (Pola et al. 2005b), Maldives (Yonow 2012), Réunion Island, Tanzania (Yonow 2012), South Africa (Gosliner 1987) and Mozambique (Gosliner et al. 2008).