new species:
Crenicichla ypo Piálek, Říčan, Casciotta & Almirón, 2010

type locality:
Argentina, Misiones, río Paraná basin, arroyo Urugua-í at Establecimiento “Alto Paraná”, approx. 25º57.9’S-54º06.5’W

published in:
Casciotta, J., A. Almirón, L. Pialek, S. Gómez & O. Rican (2010):
Crenicichla ypo (Teleostei: Cichlidae), a new species from the middle Paraná basin in Misiones, Argentina.
Neotropical Ichthyology 8 (3): 643-648

abstract (from publication):
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.