Description of Silvinichthys pedernalensis n. sp. (Teleostei, Siluriformes) from the Andean Cordillera of southern South America

FERNANDEZ L.; SANABRIA E.; QUIROGA L.

Animal Biodiversity and Conservation

Museu de Ciències Naturals de Barcelona

Año: 2017

1578-665x

Description of Silvinichthys pedernalensis n. sp. (Teleostei, Siluriformes) from the Andean Cordillera of southernSouth America.? Silvinichthys pedernalensis, a new species, is described from an Andean stream in ProvinciaSan Juan, Argentina, based on its coloration pattern, and its meristic, morphometric and osteological characters.S. pedernalensis differs markedly from all other known members of the genus Silvinichthys as a result ofthe combination of the absence of pelvic girdle and fin, the wide supraorbital bone, the number of interopercleodontodes 14?18, the number of opercular odontodes 6?8, the branched pectoral?fin rays 7, the dorsal?fin rays11, the number of dorsal pterygiophore 7, the branchiostegal rays 6, the dorsal procurrent caudal?fin rays 14and ventral 15, the ribs 16, the vertebrae 39, the dark marmorated pigmentation on the body and head, the headdepth 9.9?12.2% SL, the interorbital wide 28.3?36.1% HL, the nasal barbel length 27.3?39.0% SL, the maxillarybarbel length 39.5?61.7% SL, the submaxillary barbel length 24.7?41.9% SL, the snout length 40.6?44.4% HL,the body depth 10.1?12.6% SL, the anal base fin 10.2?11.7% SL, and the caudal peduncle length 19.3?21.5% SL.