Crenicichla ypo (Teleostei: Cichlidae), a new species from the middle Paraná basin in Misiones, Argentina

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. Una nueva especie de Crenicichla, C. ypo, es descripta de la cuenca del arroyo Urugua-í, tributaria de la margen izquierda del río Paraná medio, provincia de Misiones, Argentina. La nueva especie es reconocida por tener 6 a 8 manchas irregulares sobre la línea lateral superior, ausencia de pequeñas manchas oscuras dispersas sobre el flanco, bajo número (47-55) de escamas en la serie E1 y la quijada inferior levemente prognata. Las hembras tienen una coloración distintiva en la aleta dorsal con una banda ancha negra en la porción distal y otra roja del mismo ancho por debajo de esta.

Karyoevolution ofCrenicichlaheckel 1840 (Cichlidae, Perciformes): a process mediated by inversions

“…Crenicichla Heckel, 1840 (Cichliformes) is considered the most species rich genus of Neotropical cichlids with approximately 90 valid species, subdivided in nine groups based on morphology (Kullander, 2003; Varella and Ito, 2017). The genus is widely distributed in all river basins east of the Andes including coastal drainages from Venezuela and the Guianas as far South as the Plata river in Argentina (Kullander, 2003; Kullander et al, 2010; Casciotta et al, 2010; Mattos et al, 2014).…”

Description of a new species of the Neotropical cichlid genus Gymnogeophagus Miranda Ribeiro, 1918 (Teleostei: Cichliformes) from the Middle Paraná basin, Misiones, Argentina

“…peliochelynion , in which it is yellow [12]. The dorsal fin coloration within both species groups of Gymnogeophagus is one of the best character complexes that, in combination with other color pattern characters, enables virtually complete species determination [2, 3, 5]. The new species, G .…”

“…Cichlidae is one of the most diverse families of fishes of the world, with almost 600 valid species in the Neotropical region which are included into Cichlinae [1]. Within this subfamily, Gymnogeophagus Miranda Ribeiro 1918 includes 18 extant species [2, 3] and one fossil [4], distributed in the La Plata basin, the Laguna dos Patos system, and the río Tramandaí basin, plus a single record of G . balzanii from the río Guaporé in the Amazon basin [2,5].…”

“…However, a new species of the G . rhabdotus group was described recently from the Middle Paraná basin [3] and Říčan et al . [7] highlighted this area as a possible hotspot of fish endemism that also includes several putatively new species of Gymnogeophagus .…”

Oligosarcus amome (Ostariophysi: Characidae), a new species from the río Uruguay basin, Misiones, Argentina

“…The ríos Uruguay, Paraná, and Iguazú form the main boundaries of this province and with their different sets of species offer an ideal setting for the study of faunal evolution in the larger context of the La Plata basin (Říčan et al, 2011;Piálek et al 2012). Recent collecting trips allowed us to find several new species endemic to this region (Casciotta et al , 2013Piálek et al 2010;Říčan et al 2011).…”