Pseudacanthicus pirarara: A new species of Pleco from the Rio Xingu Basin of Brazil.

Armoured Catfish, Loricariidae, are large Catfish that have bodies covered with extensive bony scales and mouth parts modified to form suckers that are found in most freshwater ecosystems in South America. They are widely traded in the aquarium trade as 'Plecs' or 'Plecos', with stripey forms known as 'Tiger Plecos', and a number of species are known in the aquarium trade that have not yet formally been described in the scientific literature. Members of the genus Pseudacanthicus are found in French Guiana, Guyana, Suriname and northern Brazil. They are distinguished by a series of keels along their body, formed by rows of scales with sharp points. 

In a paper published in the Journal of Fish Biology on 24 October 2016, Carine Chamon of the Laboratório de Ictiologia Sistemática at the Universidade Federal do Tocantins, and Leandro Souza of the Laboratório de Ictiologia de Altamira at the Universidade Federal do Pará, describe a new species of Pseudacanthicus from the Rio Xingu Basin of Brazil.

The new species is named Pseudacanthicus pirarara, where 'pirarara' is a name commonly applied to red tailed Catfish in Brazil. The species is described from 43 specimens, ranging from 55.7 to 310 mm in length, and have distinctive orange-to-red fins and tail. The Fish was found in the Rio Xingu and a number of its tributaries, generally found in main river channels at depths of up to 15 m. They are carnivorous, feeding mainly on small invertebrates.

Pseudacanthicus pirarara in natural habitat at Gorgulho da Rita. Chamon & Souza (2016).

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Panaqolus tankei, a new species of Tiger Pleco from the Xingu Basin of Brazil.

Armoured Catfish, Loricariidae, are large Catfish that have bodies covered with extensive bony scales and mouthparts modified to form suckers that are found in most freshwater ecosystems in South America. They are widely traded in the aquarium trade as 'Plecs' or 'Plecos', with stripey forms known as 'Tiger Plecos', and a number of species are known in the aquarium trade that have not yet formally been described in the scientific literature.

In a paper published in the journal PLoS One on 9 November 2016, Christian Andreas Cramer of the Center for Human Genetics at Philipps-University Marburg and the Laboratório de Ictiologia e Pesca at the Universidade Federal de Rondónia and Leandro Melo de Sousa of the Laboratório de Ictiologia at the Universidade Federal do Pará describe a new species of Armoured Catfish from the Xingu Basin of Pará State in Brazil.

The new species is placed in the genus Panaqolus, and given the specific name tankei, in honour of the aquarist Andreas Tanke, for his dedication to the study of Plecs of the genus Panaqolus, andfor being the first person to breed the new species in captivity. The species is small-to-medium sized for a Loricariid, with the largest recorded individual measuring 83 mm in length. The species has a yellowish brown base colouration with darker stripes.

Live coloration of Panaqolus tankei, from the region of Vitória do Xingu (live aquarium specimen). Ralf Heidemann in Cramer & de Sousa (2016).

The species is found on the lower Xingu River, downstreamBeloMonte Waterfalls, typically being found associated with sunken trees and wood. A major hydroectric power plant is currently beinf constructed on the middle reaches of the Xingu, and what effect this will have on the many Catfish species found in the river, the majority of which have very limited distributions, is unclear.

Typical habitat of Panaqolus tankei. Riverbank in Lower Xingu. Cramer & de Sousa (2016).

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A new species of Armored Catfish from Pará State, Brazil.

Armored Catfish, Loricariidae, are large river-dwelling Fish native to Central and South America. They are covered in plate-like bony scales, and have distinctive 'suckermouths' used to attach themselves to a substrate in fast flowwing waters while still breathing. They are the largest group of Catfish, with over 680  described species and a fossil record that dates back to the Miocene. They are known in the aquarium trade as 'plecs'.

In a paper published in the journal ZooKeys on 29 April 2014, Gabriel de Souza da Costa e Silva, Fábio Fernandes Roxo, Ricardo Britzke and Claudio Oliveira of the Laboratório de Biologia e Genética de Peixes at the Departamento de Morfologia at the Instituto de Biociências at the Universidade Estadual Paulista "Júlio de Mesquita Filho", describe a new species of Armored Catfish from the Rio Tapajós and Rio Tracuá in Pará State, Brazil.

The new species is placed in the genus Pseudancistrus and given the specific name zawadzkii, in honour of Cláudio Henrique Zawadzki, of the Universidade Estadual de Maringá, an expert on Catfish.  Pseudancistrus zawadzkii is a 128.7−87.5 mm dark greenish-brown Armoured Catfish with yellow spots. It has a distinctive 'mustache' of odontodes (a form of scale structurally similar to a tooth, with a pulp cavity and dentine and enamel layers, but found outside the mouth and not used as a tooth) on either side of the snout. Such structures are usually for sensory purposes in Fish; just as human teeth can be notoriously sensitive to the wrong things being placed in our mouths, the tooth-like structures of some fish can be used to probe sediments or scent the water for desired foodstuffs.

Pseudancistrus zawadzkii, female specimen. Silva et al. (2014).

Pseudancistrus zawadzkii was found living living around the confluence of the Rio Tapajós and Rio Tracuá in Pará State, Brazil; an area of fast flowing, clear waters with numerous waterfalls and rocky islands.

Map showing the two locations (black circle and red square) where Pseudancistrus zawadzkii was found living. Silva et al. (2014).

See also...

 Terrestrial hunting in European Catfish.

 A new species of Catfish from Minas Gerais State in southeast Brazil.

 Two new species of Armored Catfish from Columbia.

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A new species of Catfish from Minas Gerais State in southeast Brazil.

Armored Catfish, Loricariidae, are large river-dwelling Fish native to Central and South America. They are covered in plate-like bony scales, and have distinctive 'suckermouths' used to attach themselves to a substrate in fast flowwing waters while still breathing. They are the largest group of Catfish, with over 680  described species and a fossil record that dates back to the Miocene. They are known in the aquarium trade as 'plecs'.

In a paper published in the journal ZooKeys on 4 July 2013, Gabriel de Souza da Costa e Silva, Fábio Fernandes Roxo and Claudio Oliveira of the Laboratório de Biologia e Genética de Peixes at the  Departamento de Morfologia at the Universidade Estadual Paulista describe a new species of Armored Catfish from the Rio Paraíba do Sul basin in Minas Gerais State in southeast Brazil.

The new species is placed within the genus Pareiorhina, which was first described in 1947 by William Gosline of the Department of Zoology and Entomology at the Univetsity of Hawaii, and contained only a single species until 2003, since when three further species have been described. The new species is given the specific name Pareiorhina hyptiorhachis, where 'hyptiorhachis' means 'having a ridge upon its back', referring to a ridge on the back of the Fish that runs from behind the dorsal fin to the top of the tail, and which distinguishes it from other Fish in the same genus.

The species is described entirely from specimens preserved in alcohol in the collections of the Laboratório de Biologia e Genética de Peixes de Botucatu and the Museu de Ciências e Tecnologia at the Pontifícia Universidade Católica do Rio Grande do Sul, collected between 2001 and 2011, but not previously recognized as a separate species.

Pareiorhina hyptiorhachis, specimen collected from the Ribeirão Fernandes, a tributary of Rio Pomba, in June 2011. Da Costa e Silva et al. (2013).

See also Two new species of Armored Catfish from Columbia, A new species of Armored Catfish from Peru and New species of Armored Catfish from Ecuador.

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Two new species of Armored Catfish from Columbia.

Armored Catfish, Loricariidae, are large river-dwelling Fish native to Central and South America. They are covered in plate-like bony scales, and have distinctive 'suckermouths' used to attach themselves to a substrate in fast flowwing waters while still breathing. They are the largest group of Catfish, with over 680  described species and a fossil record that dates back to the Miocene. They are known in the aquarium trade as 'plecs'.

In a paper published in the journal Zootaxa on 26 April 2013, Donald Taphorn of Belleville Illinois, Jonathan Armbruster of Department of Biological Sciences at Auburn University, Francisco Villa-Navarro of the Grupo de Investigación en Zoología at the Facultad de Ciencias at the Universidad del Tolima and Keith Ray, also of the Department of Biological Sciences at Auburn University, describe two new species of Armored Catfish in the genus Ancistrus as part of a wider study into the genus in Panama, Colombia and Venezuela.

The first new species described is named Ancistrus tolima, where 'tolima' refers to both to Yulima, a Pijao princes who was murdered by the Spanish conquistadores, and to the Department of Tolima in Columbia, where the Fish was discovered. Ancistrus tolima is a 26-77 mm dark olive or brown Catfish with light green or yellow spots. It was found living in shallow streams with little vegetation and a sand or gravel bottom in the Upper Magdalena River drainage system.

Live specimen of Ancistrus tolima. Taphorn et al. (2013).

The second new species is named Ancistrus vericaucanus, meaning 'true inhabitant of the Cauca'; another species has previously been named Ancistrus caucanus (inhabitant of the Cauca), however this species is now known to be restricted to the Magdalena River drainage and is not found in the Cauca River. Ancistrus vericaucanus is 47-72 mm Armored Catfish. The species is described from specimens collected in November 2006 and preserved in alcohol; the original colour of these specimens is unclear.

Specimen of Ancistrus vericaucanus, preserved in alcohol. Taphorn et al. (2013).

See also A new species of Armored Catfish from Peru and New species of Armored Catfish from Ecuador.

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