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Silvinichthys Gualcamayo, a New Species of Catfish from the Central Andes of Argentina (Siluriformes: Trichomycteridae)

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Silvinichthys Gualcamayo, a New Species of Catfish from the Central Andes of Argentina (Siluriformes: Trichomycteridae) 367 Ichthyol. Explor. Freshwaters, Vol. 23, No. 4, pp. 367-373, 3 figs., 2 tabs., March 2013 © 2013 by Verlag Dr. Friedrich Pfeil, München, Germany – ISSN 0936-9902 Silvinichthys gualcamayo, a new species of catfish from the central Andes of Argentina (Siluriformes: Trichomycteridae) Luis Fernández*, Eduardo A. Sanabria** and Lorena B. Quiroga*** Silvinichthys gualcamayo, new species, is described from a stream at 2000 m elevation in the lower slope of the Andean cordillera of San Juan, Argentina. It is distinguished from the three previously described species in the genus by the following combination of characters: the pelvic fin and girdle absent, the caudal peduncle expand- ed posteriorly toward caudal-fin, the caudal peduncle length 22.0-23.9 % SL, 9-10 dorsal-fin rays, 5-6 branched dorsal-fin rays, 38 vertebrae total, 9 opercular odontodes, 20 interopercular odontodes, 7 pectoral-fin rays, and the wide supraorbital tendon bone. Introduction on its possession of a number of unusual modi- fications, such as the entire skin surface perfo- The Andean drainages are temporary endorrheic rated by pores of the ampullary organs or the and occasional permanent watercourses fed by reduction of the cephalic laterosensory canal snow melt of higher elevations. These basins system to the nasal portion of the supraorbital usually present small populations of a few or only canal and the postotic canal. Fernández & de one fish species able to survive in the severe Pinna (2005) subsequently described a second Andean conditions (Arratia, 1998; Fernandez & species, S. bortayro, from phreatic waters situated Vari, 2000). Small isolated basins have resulted at 1258-1356 m asl. Recently, Fernandez et al. in notable degrees of endemicity in the Andean (2011) described a third species, S. leoncitensis, ichthyofauna, specially among trichomycterines from a small creek at 1213 m altitude in a Na- with more than 20 species reported from central tional Park of the San Juan province. and northwestern of Argentina (Fernández & We herein describe a fourth species of Silvin- Vari, 2009). ichthys, the third one lacking the pelvic girdle and In 1998, Arratia proposed the monotypic genus fins, endemic to the Andean cordillera. Silvinichthys for Trichomycterus mendozensis based * CONICET, Facultad Ciencias Exactas y Naturales, Universidad Nacional de Catamarca and Instituto Lillo, Miguel Lillo 251, 4000 Tucumán, Argentina. E-mail: [email protected] ** CONICET, Instituto de Histología de Mendoza, Mendoza and Departamento de Biología, Universidad Na- cional de San Juan, Avenida Ignacio de la Roza y Meglioli, San Juan, Argentina. E-mail: [email protected] *** Departamento de Biología, Universidad Nacional de San Juan, Avenida Ignacio de la Roza y Meglioli, San Juan, Argentina. E-mail: [email protected] Ichthyol. Explor. Freshwaters, Vol. 23, No. 4 The whole contribution can be Dieser Beitrag kann als purchased as PDF fi le. PDF-Datei erworben werden. Availability Verfügbarkeit von PDF-Dateien Prinzipiell sind von allen unseren Publikationen PDF- Generally all our publications are available as PDF fi les; Dateien erhältlich. 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