Sipunculans and Echiurans of Isla del Coco (Cocos Island), Costa Rica Author Vargas, Rita Author Kawauchi, Gisele Y. text Zootaxa 2010 2557 60 68 journal article 10.5281/zenodo.196936 a2d81a5c-6c54-40d9-946d-86fa5224d0fd 1175-5326 196936 Phascolosoma agassizii Keferstein, 1866 Masterial examined. Punta Ulloa, 23 May 2008 , one specimen, 23 mm . Description. There are 17 well-developed longitudinal muscle bands and approximately 33 rings of hooks; hooks with indistinct triangles. The scattered papillae in the anal region are similar to the dome-like trunk papillae. This specimen lacks pigmented areas on the trunk or introvert. Habitat. Subtidal calcareous rock, 3 m . Remarks. This is the first record for this species from Pacific Costa Rica . Distribution. This species is known from both sides of the Pacific Ocean, the Indian Ocean, and the southeastern Atlantic Ocean ( Cutler 1994 ).