Sipunculans and Echiurans of Isla del Coco (Cocos Island), Costa Rica Vargas, Rita Kawauchi, Gisele Y. Zootaxa 2010 2557 60 68 6MXL [151,325,1229,1255] Phascolosomatidea Phascolosomatidae Phascolosoma Animalia Phascolosomatiformes 3 63 Sipuncula genus   Material examined. Bahía Chatham, intertidal calcareous rock, April 2008, two specimens, 9 and 20 mm; Punta Ulloa, subtidal calcareous rock, 3 m, 28 May 2008, three specimens, 19, 22 & 34 mm; 12 m, drag, 23 May 2008, one specimen, 28 mm(gravid); Silverado, subtidal calcareous rock, 11 m, 25 May 2008, one specimen, 26 mm.   Description.The body has scattered, small, rounded papillae with some densely packed conical papillae at the posterior end. Anterior to the anus there are reddish papillae with a wide base and an extended, nipplelike region. There are approximately 40 rows of hooks and the introvert is pigmented on the dorsal surface; hooks with a small secondary tooth.  Habitat.Intertidal-subtidal, calcareous rock, 0– 15 m.   Remarks.This is probably what has been previously identified as  Phascolosoma perlucensBaird, 1868for Costa Rica, however it is apparent that the small secondary tooth is unlike the larger, rounded tooth described for  P. perlucensin Cutler (1994). The nature of the pre-anal papillae is also dissimilar.