Zoosymposia: the Genus Onoba

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Zoosymposia 1: 233–245 (2008) ISSN 1178-9905 (print edition) www.mapress.com/zoosymposia/ ZOOSYMPOSIA Copyright © 2008 · Magnolia Press ISSN 1178-9913 (online edition) The genus Onoba (Mollusca, Caenogastropoda, Rissoidae) from NW Spain, with the description of two new species EMILIO ROLÁN Museo de Historia Natural, Campus Universitario Sur, 15782 Santiago de Compostela, Spain Abstract Some species of the genus Onoba were described from the Ria de Vigo. The revision shows that their identiﬁ cation had not been correct and they are now described as new species, and are compared to similar ones. All species are illustrated by SEM, including radular preparations. Key words: Rissoidae, Onoba,Onoba aculeus, new species. Introduction The genus Onoba H. & A. Adams, 1852 was revised by Ponder (1985), considering it a Recent genus, extending to western Europe and the Mediterranean. The genus is also present in North America (Warén 1974) and in the Antartic and subantartic waters (Ponder 1983) and in southwestern South America (Ponder & Worsfold 1994). Some species have been described from Macaronesian Islands (Watson 1873; Moolenbeek & Hoenselaar 1987; Rolán & Hernández 2004). Templado & Rolán (1986) revised the European species. Hoenselaar & Moolenbeek (1987) and Moolenbeek & Hoenselaar (1987) described new species from the Iberian Peninsula and the Azores. Rolán (1983) illustrated four species in the genera Onoba and CeratiaH. & A. Adams, 1852: Ono- ba striata (Montagu, 1803), Onoba aculeus (Gould, 1841), Onoba vigoensis Rolán, 1983 and Ceratia proxima (Forbes & Hanley, 1850). All these names must be changed for various reasons: The ﬁ rst species is a junior synonym of O. semicostata (Montagu, 1803); O. vigoensis should be reassigned to the genus Manzonia Brusina, 1870, with some comments in Rolán & Hernández (2004). The other two species are considered new to science and are described here. Abbreviations AMNH American Museum of Natural History, New York, USA. BMNH The Natural History Museum, London, Great Britain. CRBA Centre de Recursos de Biodiversitat Animal, Barcelona, Spain. MNHN Muséum National d'Histoire Naturelle, Paris, France. Accepted by D.L. Geiger: 19 May 2008; published 25 Jul. 2008 233.

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