Aspidosiphon (Paraspidosiphon) laevis

Vargas, Rita & Kawauchi, Gisele Y., 2010, Sipunculans and Echiurans of Isla del Coco (Cocos Island), Costa Rica, Zootaxa 2557, pp. 60-68: 65

publication ID

http://doi.org/ 10.5281/zenodo.196936

persistent identifier

http://treatment.plazi.org/id/039D723A-FFDA-D96D-D2A8-FF436FF7FC91

treatment provided by

Plazi

scientific name

Aspidosiphon (Paraspidosiphon) laevis
status

 

Aspidosiphon (Paraspidosiphon) laevis   de Quatrefages, 1865

Material examined. Bahia Chatham, subtidal calcareous rock, 15 m, 22 May 2008, two specimens, 15 & 29 mm; Punta María, subtidal calcareous rock, 20 m, SCUBA, rocks, 10 April 2008, one specimen, 18 mm; Punta Ulloa subtidal calcareous rock, 12 m, drag, 23 May 2008, one specimen, 25 mm; 8 m, 28 May 2008, one specimen, 24 mm; Silverado, subtidal calcareous rock, 11m 25 May 2008, four specimens, 4 to 30 mm.

Description. This species has a yellow to light tan body with a brown anal and caudal shield. The grooved anal shield has a pronounced ridge-like border posteriorly and is followed by scattered low shield units, which transition to numerous low papillae in the anal region; papillae absent in posterior half of body. Caudal shield with well developed concentric ridges radiating from its center and a distinct anterior border followed by several rows of rectangular units anterior to the ridge. Hooks are unidentate with a wide base. Retractor muscles are united until adjacent to their attachment at about 60 % of body length as a broad sheet to the body wall; nerve cord passes through the narrow gap between the retractors at their separation. Anterior spindle muscle attaches along the rectum and sends a branch that attaches broadly anterior to the anus.

Habitat. Subtidal calcareous rock, 8- 20 m.

Remarks. This is a first record for Aspidosiphon (Paraspidosiphon) laevis   in the eastern Pacific Ocean.

Distribution. Aspidosiphon (Paraspidosiphon) laevis   is previously reported from the Indo-Pacific Ocean as well as the Caribbean and western Atlantic Ocean ( Cutler 1994).