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Issue: Vol. 2557 No. 1: 3 Aug. 2010
Type: Articles
Published: 2010-08-03
DOI: 10.11646/zootaxa.2557.1.6
Page range: 60–68
Abstract views: 46
PDF downloaded: 1

Sipunculans and Echiurans of Isla del Coco (Cocos Island), Costa Rica

Museum of Comparative Zoology (MCZ), Harvard University, 26 Oxford St., Cambridge, Massachusetts 02138, USA Department of Biology, University of Massachusetts Boston, 100 Morrissey Boulevard, Boston, Massachusetts 02125-9939, USA
Centro de Investigación en Ciencias del Mar y Limnología (CIMAR), Universidad de Costa Rica (UCR), San Pedro, 11501–2060 San José, Costa Rica
Centro de Investigación en Ciencias del Mar y Limnología (CIMAR), Universidad de Costa Rica (UCR), San Pedro, 11501–2060 San José, Costa Rica
Museo de Zoologia, Escuela de Biologia, Universidad de Costa Rica (UCR), 11501-2060 San Pedro, 11501-2060 San José, Costa Rica
Museum of Comparative Zoology (MCZ), Harvard University, 26 Oxford St., Cambridge, Massachusetts 02138, USA
Annelida Sipuncula Echiura Siphonosoma Antillesoma Phascolosoma Aspidosiphon Thalessema Costa Rica Eastern Pacific

Abstract

The sipunculan fauna of Isla del Coco was found to be quite diverse with eleven species reported. Several of the sipunculan species, as well as the echiuran Thalassema steinbecki, have been encountered previously from Pacific Costa Rica. More surprising is the occurrence of several species of sipunculans not previously known from the eastern Pacific region such as Siphonosoma cumanense, Phascolosoma scolops, Aspidosiphon gosnoldi, A. misakiensis, and A. (Paraspidosiphon) laevis. Possible larval sources for those species previously unknown from this region are discussed. The identity of specimens previously identified as Phascolosoma perlucens from Pacific Costa Rica are in question and are referred to as P. sp. The presence of anastomosing longitudinal muscle bands as being characteristic of the genus Siphonosoma is discussed.

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