A new tetra in the genus Bryconamericus has been described from French Guyana by ichthyologists Axel Zarske, Pierre-Yves le Bail and Jacques Géry.
Publishing the description of Bryconamericus guyanensis in the latest issue of the journal Neotropical Ichthyology, the authors distinguish the new species from congeners in having the following combination of characters: relatively slender body depth (3.49–4.16 times in standard length), 19–21 branched anal-fin rays, 17–21 setiform gill-rakers, 38–41 scales in the longitudinal series, 4½–5â…“ transverse scales, 37–40 vertebrae, two to three maxillary teeth with three to five cusps, and premaxilla in the outer row with four to five (mostly five) teeth with three to five cusps that are arranged in a irregular row.
Bryconamericus guyanensis, named for its distribution, is found in shallow tributaries of river systems throughout French Guyana. The water is typically clear, fast-flowing and with a substrate of rock, gravel and sand, sometimes with mud and plant debris.
For more information, see the paper: Zarske, A, P-Y le Bail and J Géry (2010) New and poorly known characiform fishes (Teleostei: Characiformes: Characidae) from French Guyana. A new tetra of the genus Bryconamericus. Vertebrate Zoology 60, pp. 3–10.