Abstract
A new species of Crenicichla, C. ypo, is described from the Arroyo Urugua-í, a left-hand tributary of the middle Paraná River, Misiones province, Argentina. The new species is recognized by 6 to 8 irregular blotches along the upper lateral line, absence of scattered dark spots on flanks, low number (47-55) of E1 scales, and a slightly prognathous lower jaw. Females have a distinctive coloration of the dorsal fin, with a wide black longitudinal stripe on the distal portion with an equally wide red stripe below it.
Highlights
The genus Crenicichla Heckel includes at present about 80 valid species and is the most speciose genus within the family Cichlidae (Kullander, 2003, 2009; Casciotta et al, 2006)
The aim of this paper is to describe a new species of Crenicichla restricted to the arroyo Urugua-í, middle Paraná basin, Argentina
The new species, Crenicichla ypo, is in its morphology more similar to other species of Crenicichla from the Paraná River basin, than to species from the Uruguay River (C. celidochilus, C. empheres, C. gaucho, C. hadrostigma, C. igara, C. jurubi, C. minuano, C. missioneira, C. prenda, C. scottii, C. tendybaguassu). These Uruguayan species are traditionally included in the C. missioneira and C. scottii species groups (Lucena & Kullander, 1992; extended by Kullander et al, 2010), and differ from the discussed taxa in a combination of color-pattern and meristic characters (Lucena & Kullander, 1992)
Summary
The genus Crenicichla Heckel includes at present about 80 valid species and is the most speciose genus within the family Cichlidae (Kullander, 2003, 2009; Casciotta et al, 2006). The Paraná River basin with 3,100,000 km is the second largest basin of South America, and fourteen species of Crenicichla are known from that basin (Kullander, 2003, 2009; Casciotta et al, 2006; Casciotta & Almirón, 2008). Some of them, such as C. haroldoi Luengo & Britski, C. jaguarensis Haseman, and C. britskii Kullander are restricted to the upper Paraná basin. Crenicichla semifasciata (Heckel), C. lepidota, C. scottii, and C. vittata are found both in the lower and middle Paraná basin (C. scottii in lower only), and the last three species are present in the Uruguay River (Casciotta, 1987; Lucena & Kullander, 1992)
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