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15 September 2006 A New Species of Killifish in the Genus Orestias (Teleostei: Cyprinodontidae) from the Southern High Andes, Chile
Abstract

A new species of Cyprinodontidae, Orestias piacotensis new species, is described from Laguna Piacota in the southern high Andean region (18°11′49.8″S, 69°15′56.9″W). It is a small and slender-bodied fish with mottled blackish bands on its flanks, fading to white on the belly and should be classified in the “agassii complex.” Its head is moderately large with large eyes whose orbits do not reach the dorsal profile. This species is distinguished from the rest of the “agassii complex,” by possessing a wide protractile mouth with slightly upturned lower jaws, and pectoral, dorsal, and anal fins with elongate middle rays, pointed and with a reduced (12–16) and constant number of rays. It has a long and narrow caudal peduncle. Rounded, irregularly-sized, small scales cover the sides of the body, being absent from the dorsal and ventral parts of the body. The gill rakers are long, rounded, and closely spaced. Both sexes have 52 chromosomes.

Se describe una especie nueva de Cyprinodontidae, Orestias piacotensis nov. sp., en la Laguna Piacota ubicada en la región altoandina sur (18°11′49.8″S, 69°15′56.9″W). Es un pez pequeño y esbelto con bandas negras laterales, cambiando a color blanco en la zona ventral. Debería ser incluido en el “complejo agassii.” La cabeza es moderadamente grande con ojos grandes cuyas órbitas no alcanzan el perfil dorsal primario. Esta especie se distingue del resto de las especies del “complejo agassii” por poseer una boca protráctil ancha con mandíbulas levemente inclinadas hacia arriba, aletas dorsales, pectorales y anales con rayos centrales alargados por lo que se ven puntiagudas y tienen número de rayos reducido (12–16) y constante, con un pedúnculo caudal largo y angosto. Escamas pequeñas, redondeadas y de tamaño irregular cubren los costados del cuerpo y están ausentes en el dorso y vientre. Las branquioespinas son largas, redondeadas y cercanas entre sí. Ambos sexos tienen 52 cromosomas.

Irma Vila "A New Species of Killifish in the Genus Orestias (Teleostei: Cyprinodontidae) from the Southern High Andes, Chile," Copeia 2006(3), (15 September 2006). https://doi.org/10.1643/0045-8511(2006)2006[472:ANSOKI]2.0.CO;2
Received: 29 October 2003; Accepted: 18 April 2006; Published: 15 September 2006
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