Abstract
ABSTRACT A survey of the invertebrate fauna of coral reef hard bottom communities in the shallow waters of Isla del Coco yielded a new species of mysid belonging to the genus Heteromysis S. I. Smith, 1873. Heteromysis (Olivemysis) cocoensis, n. sp. was collected from coral rubble at depths of 8 to 34 m. It differs from its congeners by having male pleopods 1, 3, and 4 with modified setae. Within the subgenus Olivemysis Bacescu, 1968, the new species is morphologically most similar to Heteromysis. ekamako Wittmann and Chevaldonne, 2017 from the Pacific, Heteromysis. gomezi Bacescu, 1970, H. mayana Brattegard, 1970, and H. rubrocinta, Bacescu, 1968 from the Western Atlantic, and Heteromysis. dardani Wittmann, 2008, Heteromysis. wirtzi Wittmann, 2008, and Heteromysis. sabelliphila Wittmann and Wirtz, 2017 from the Eastern Atlantic. However, H. cocoensis n. sp. is distinguished from these six apparently closely related species by the following combination of characters: flagellate, modified setae on articles 1 and 3 of the antennular peduncle, and setation of thoracic endopod 3, male pleopods 1, 3 and 4, uropodal endopods, and the apical and lateral margins of the telson. A diagnostic table separating these eight species is given.
Highlights
Price (2004) and Price et al (2009) published annotated compilations of the published literature for the members of the family Mysidae Haworth, 1825 sensu lato reported from the Pacific waters of the Americas and Costa Rica, respectively
The marine biodiversity of Isla del Coco, which lies 550 km West Southwest of the Costa Rican mainland, is relatively well known, with more than 1,100 species reported to date (Cortés and Wehrtmann, 2009; Sibaja-Cordero et al, 2016)
Mysids were sampled from coral reefs along the northeastern end of Isla del Coco and the north side of its satellite Isla Manuelita in Oct. 2007, May 2008, and Jul. 2011
Summary
Price (2004) and Price et al (2009) published annotated compilations of the published literature for the members of the family Mysidae Haworth, 1825 sensu lato reported from the Pacific waters of the Americas and Costa Rica, respectively. Based on these reports and our review of the more recent literature, there are no published descriptions or records of mysids from Isla del Coco (5o30’–5o34’N 87o02’–87o06’ W). The description of this new species is presented
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