Trapezia bidentata (Forskål, 1775)

Material examined. One male (ICMyL MAZ 9408A) and one ovigerous female (ICMyL MAZ 9408B) from Islas Marietas, and three males (ICMyL MAZ 9421A), two females (ICMyL MAZ 9421B), and two ovigerous females (ICMyL MAZ 9421C) from Playa Coral (15°51´N, 97°05´W).

Remarks. This species is symbiotic with corals and has a circumptropical distribution (Castro 1997). Along the Mexican tropical Pacific coast, records were made at Isla Isabel (21°51´N, 105°51´W) (Ríos-Jara et al. 2008), Zihutanejo (see Pereyra 1998), and the Huatulco region (Ramírez-Luna et al. 2002). This species was seen in all sampled sites and we confirm its distribution in the study area.