A new species of trichomycterid catfish has been described from specimens collected in southeastern Brazil's Morro do Diabio State Park.
The new species, which was named Trichomycterus diabolus by Bockmann, Casati and de Pinna in their paper in Ichthyological Exploration of Freshwaters this month, lives in the Rio Paranapanema system.
It's distinguished from other Trichomycterus species on the presence of a narrow, unpigmented vertical stripe in the top half of the tail fin, which ends in a white occelus on the top lobe.
The authors suggest that the presence of this stripe may link it to T. castroi. It's also thought to be a sister-taxon to an as yet undescribed candiru found in the Rio Parana at Ponta Pora.
For more details see the full paper: Bockmann, FA., Casatti, L. and MCC de Pinna (2004) - A new species of trichomycterid catfish from the Rio Paranapanema basin, southeastern Brazil, (Teleostei: Siluriformes) with comments on the phylogeny of the family. Ichthyological Exploration of Freshwaters. Vol. 15. No. 3