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Tiny new catfish species found in Rio Paraíba do Sul basin, Brazil

Date:
July 9, 2013
Source:
Pensoft Publishers
Summary:
A new diminutive species of catfish was found in Rio Paraíba do Sul basin in Brazil. The genus to which the new Pareiorhina hyptiorhachis belongs represents a group of species endemic to Brazil. Although the new species is only around 3 cm in length it is still larger than the smallest catfish that is only 1 cm when sexually mature.
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This image shows the newly discovered catfish Pareiorhina hyptiorhachis.
Credit: Gabriel de Souza da Costa e Silva; CC-BY 3.0

Scientists discovered a tiny new species of catfish in the waters of Rio Rio Paraíba do Sul basin, Brazil. The new species Pareiorhina hyptiorhachis belongs to a genus of armored catfishes native to South America where and found only in Brazil. These peculiar fish get their name from their strange elongated mouth barbels that remind of cat's whiskers. The new species is distinguished from others species of the genus by the presence of a conspicuous ridge on the trunk posterior to the dorsal fin (postdorsal ridge).

The description of the diminutive new species was published in the open access journal Zookeys.

Pareiorhina hyptiorhachis is only about 3-3.5 cm in length, making one of the smallest representatives of the catfish order. Although the new species is only the size of a decorative fish, there are even smaller representatives in the group. Some of the smallest species of Aspredinidae and Trichomycteridae for example reach sexual maturity at only 1 cm in total.

On the other side of the scale is the wels catfish whose representatives can reach more than 2.5 metres (8.2 ft) in length and sometimes exceeded 100 kilograms (220 lb). This fish has been also recorded to feed on frogs, rats, mice and even some aquatic birds. Many of the large catfish species are farmed or fished for food thus being of significant scientific importance. Small representatives, on the other hand, are often used as aquarium decorative fish.


Story Source:

The above post is reprinted from materials provided by Pensoft Publishers. The original story is licensed under a Creative Commons License. Note: Materials may be edited for content and length.


Journal Reference:

  1. Gabriel da Costa e Silva, Fábio Roxo, Claudio Oliveira. Pareiorhina hyptiorhachis, a new catfish species from Rio Paraíba do Sul basin, southeastern Brazil (Siluriformes, Loricariidae). ZooKeys, 2013; 315: 65 DOI: 10.3897/zookeys.315.5307

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Pensoft Publishers. "Tiny new catfish species found in Rio Paraíba do Sul basin, Brazil." ScienceDaily. ScienceDaily, 9 July 2013. <www.sciencedaily.com/releases/2013/07/130709115858.htm>.
Pensoft Publishers. (2013, July 9). Tiny new catfish species found in Rio Paraíba do Sul basin, Brazil. ScienceDaily. Retrieved July 4, 2015 from www.sciencedaily.com/releases/2013/07/130709115858.htm
Pensoft Publishers. "Tiny new catfish species found in Rio Paraíba do Sul basin, Brazil." ScienceDaily. www.sciencedaily.com/releases/2013/07/130709115858.htm (accessed July 4, 2015).

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