Ichthyologists from the College of Charleston have described a new species of Creagrutus tetra from the Ucayali River drainage in the Andes Mountains of southeastern Peru.
Antony Harold and Norma Salcedo published the description of Creagrutus yanatili in a recent issue of the journal Ichthyological Exploration of Freshwaters.
Creagrutus yanatili, named after one of the water bodies (the Yanatili River) in which it was caught, is distinguished from congeners in having very dark, nearly black pigmentation covering the front part of the gill cover, much of the body and fins, and males with a combination of hook-like and straight, needle-like contact organs, on up to six of the anterior branched anal-fin rays and all pelvic-fin rays.
The new tetra was caught in a wide, shallow river with a substrate of sand, pebbles and larger smooth stones.
For more information, see the paper: Harold, AS and NJ Salcedo (2009) Creagrutus yanatili, a new species from the Río Urubamba drainage, southeastern Peru (Teleostei: Characidae). Ichthyological Exploration of Freshwaters 20, pp. 377–383.