Ituglanis crispim, new species from the Rio Parnaíba

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bekateen
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Ituglanis crispim, new species from the Rio Parnaíba

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Donin, L.M., de Pinna, M.C.C., Severi, W. & T.P.A. Ramos. (2023). Filling in a biogeographic gap: the first Trichomycteridae from the Parnaíba River basin (Siluriformes: Trichomycteridae). Neotrop. Ichthyol., 21(2).
https://doi.org/10.1590/1982-0224-2023-0018
https://www.scielo.br/j/ni/a/XbCqkszhC3mDgyGgwKjcysK
Abstract
Trichomycterid catfishes have long been considered as absent in the Parnaíba River basin, Northeastern Brazil, in what constitutes their most conspicuous gap in geographic distribution. Herein we report on the first occurrence of the family in that basin. The new species is described from the riacho da Volta, right tributary to the upper rio Parnaíba, Piauí State. It is distinguished from its congeners by the combination of two or three pairs of ribs; 36–38 post Weberian vertebrae; a color pattern composed of round, similar-sized, non-coalescent spots; I,5 pectoral-fin rays; the first haemal arch on the 5th or 6th vertebrae; and the first completely fused (to the tip) haemal spine on the 15th vertebra. A putative autapomorphy is the partial (minimally 50% of their length) or total fusion between the anterior arms of the basipterygium. Preliminary evidence suggests that the new species can be related to northern South American forms, a pattern that fits the general Amazonian relationships of the fishes in the Parnaíba River drainage. Although the new species fills in an important qualitative gap in trichomycterid continental distribution, the taxon is apparently rare and extremely restricted in distribution, with the type series being its only record so far. The paucity of trichomycterids in the Parnaíba remains a puzzling biogeographical phenomenon.
Keywords: Ituglanis; New species; Taxonomy; Trichomycterinae

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Re: Ituglanis crispim, new species from the Rio Parnaíba

Post by genghiskhanll »

Hello, how are you?
Just a notice.
The species Ituglanis crispim was described for the Parnaíba River basin in the state of Piauí, Brazil, and it is endemic to this region. There is no record of this species in the La Plata or Paranaíba River basins. The species page is providing incorrect information. Parnaíba River and Paranaíba River are two different rivers that occur in different regions of Brazil.
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bekateen
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Re: Ituglanis crispim, new species from the Rio Parnaíba

Post by bekateen »

genghiskhanll wrote: 16 May 2023, 03:57Hello, how are you?
Just a notice.
The species Ituglanis crispim was described for the Parnaíba River basin in the state of Piauí, Brazil, and it is endemic to this region. There is no record of this species in the La Plata or Paranaíba River basins. The species page is providing incorrect information. Parnaíba River and Paranaíba River are two different rivers that occur in different regions of Brazil.
Thank you for bringing that to our attention. It should be fixed now.

Cheers, Eric
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