Abstract
<p>The molluscan fauna of Isla del Coco has recently been well documented, but the heterobranch sea slugs, traditionally called “opisthobranchs”, remain poorly known. We report 13 new records, increasing the total to 40 species. Of the 13 newly discovered species, the following species had not been previously recorded along the Pacific Costa Rican mainland: <em>Berthella californica </em>(Dall, 1900), <em>Peltodoris rubra</em> (Bergh, 1905), <em>Dendrodoris albobrunnea </em>Allan, 1933, <em>Doriopsilla</em> cf. <em>spaldingi </em>Valdés &amp; Behrens, 1998, <em>Glaucus</em> cf. <em>marginatus</em> (Reinhardt &amp; Bergh, 1864), and <em>Flabellina</em> sp. Additionally, we report <em>Peltodoris rubra</em>, previously known from the Indo-Pacific, for the first time in the Eastern Tropical Pacific.</p><div> </div>
Highlights
Among the marine species recently reported for Isla del Coco, the mollusks represent the most species-rich group with 490 species (Cortés, 2012)
Of the 13 newly discovered species, the following species had not been previously recorded along the Pacific Costa Rican mainland: Berthella californica (Dall, 1900), Peltodoris rubra (Bergh, 1905), Dendrodoris albobrunnea Allan, 1933, Doriopsilla cf. spaldingi Valdés & Behrens, 1998, Glaucus cf. marginatus (Reinhardt & Bergh, 1864), and Flabellina sp
A total of 13 species were collected from Isla del Coco, increasing the total known opisthobranch fauna to 40 species
Summary
Among the marine species recently reported for Isla del Coco ( known as Cocos Island), the mollusks represent the most species-rich group with 490 species (Cortés, 2012). Valdés, & Camacho-García (2004) reported four species of cephalaspideans from Isla del Coco: Cylichnella defucnta (Baker & Hanna, 1972, reported as Atys defuncta), Navanax aenigmaticus (Bergh, 1893), Cylichna atahualpa (Dall, 1908) and Volvulella catharia Dall, 1919. Camacho-García (2009) reported 11 benthic opisthobranchs for Isla del Coco. Among the species reported that are not included in the previous studies mentioned above, are: Felimida sphoni Ev. Marcus, 1971 (reported as Chromodoris sphoni), Phestilla lugubris (Bergh, 1870), and Tambja abdere (Farmer, 1978). All of the previous studies bring the number of opisthobranchs of Isla del Coco to 27 species. We include new reports, extended distributional ranges, morphological data and illustrate some of the more relevant species for Isla del Coco
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