Brazilian and Peruvian scientists have described a new Hemibrycon tetra from the Ucayali River drainage in Peru.
The description of the new species, Hemibrycon divisorensis, is published in the latest issue of Neotropical Ichthyology by Vicinus Bertaco, Luiz Malabarba, Max Hidalgo and Hernn Ortega.
The new species is distinguished from other members of the genus in having a wide black asymmetrical spot covering the base of the caudal-fin rays and extending along th entire length of caudal-fin rays 9 to 12"13 and by the presence of a black band in the lower half of the caudal peduncle from the region above the last anal-fin rays to the caudal-fin base.
Hemibrycon divisorensis, named after the type locality (Zona Reservada Sierra del Divisor), is known only from the Tapiche River drainage, a tributary of the Ucayali River in Peru.
Where the type specimens were collected, the streams are about 2"3 m wide with crystalline water and 0.3"0.5 m depth.
The streams had a moderate current, sandy substrate and moderate amounts of riparian vegetation.
For more information, see the paper: Bertaco, VA, LR Malarbaba, M Hidalgo and H Ortega (2007) A new species of Hemibrycon (Teleostei: Characiformes: Characidae) from the ro Ucayali drainage, Sierra del Divisor, Peru. Neotropical Ichthyology 5, pp. 251"257.