A new species of the neotropical catfish genus Trichomycterus (Siluriformes: Trichomycteridae) representing a new body shape for the family.
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American Society of Ichthyologists and Herpetologists
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Trichomycterus crassicaudatus is described as a new species from the Rio Iguac¸u basin in southern Brazil. The new
species has an exceptionally deep posterior region of the body (caudal peduncle depth 22.8–25.4% SL), resulting
in an overall shape which distinguishes it at once from all other members of the Trichomycteridae. The caudal
fin of the species is broad-based and forked, a shape also distinguishing it from all other species in the family. A
number of autapomorphic modifications of T. crassicaudatus are associated with the deepening of the caudal
region, including an elongation of the hemal and neural spines of the vertebrae at the middle of the caudal
peduncle. Phylogenetic relationships of the new species are yet unresolved, but it shares a similar color pattern
and a thickening of caudal-fin procurrent rays with T. stawiarski, a poorly-known species also from the Rio Iguac¸u
basin. Coloration and body shape also include similarities with T. lewi from Venezuela.
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WOSIACKI, Wolmar Benjamin; PINNA, Mário de. .A new species of the neotropical catfish genus Trichomycterus (Siluriformes: Trichomycteridae) representing a new body shape for the family. Copeia, n. 2, p. 273-278, 2008.