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Rhyacoglanis paranensis Shibatta & Vari, 2017

Image contributors to this species:

David Sands (2) Angelo Rodrigo Manzotti (1)

ScotCat Sources:

Other Sources:

Relevant Information:

Description: Rhyacoglanis, a new genus of the South American freshwater catfish family Pseudopimelodidae is described from cis-Andean portions of the continent. Rhyacoglanis is distinguished from other genera of the family by three synapomorphies: presence of a light blotch on the cheek; a connection between the middle of the dark caudal-fin stripe and the dark caudal-peduncle pigmentation; and 30-35 total vertebrae. Species of Rhyacoglanis are rheophilic and strongly associated with rapids and other swift-flowing waters. A phylogenetic analysis based on 41 morphological characters yields a hypothesis of monophyly of the Pseudopimelodidae and Rhyacoglanis. Pimelodus pulcher Boulenger, 1887, from the western Amazon basin is designated as type-species of the new genus and redescribed. Four new species are described (2017): Rhyacoglanis annulatus, from the río Orinoco basin, with a nearly ringed dark band on the caudal peduncle, and a larger distance between anus and anal-fin origin; R. epiblepsis, from the rio Madeira basin, with numerous dark spots scattered on the body, and rounded caudal-fin lobes; R. paranensis from the upper rio Paraná basin, with three distinct dark bands on the body, and 31-33 total vertebrae; and R. seminiger, from the rio Juruena basin, with subdorsal and subadipose dark bands fused anteroposteriorly, and a separate dark band on the caudal peduncle. Aquarium Care: Predatory in the aquarium towards fish that are smaller. Provide plenty of hiding places to hide during the day and best kept in a small group of 2-3. Very secretive in its surroundings. Diet: No problem with eating all types of aquarium fare, flake, tablets, pellets, live and frozen foods. Etymology: The specific name paranensis: paranensis, is an adjective in reference to the occurrence of the species in the upper Rio Paraná basin.

Common Name:

None

Synonyms:

None

Family:

Pseudopimelodidae

Distribution:

South America: From the upper Rio Paraná basin, Brazil.

Size:

6.5cm. (2¾ins)

Temp:

24-28°C (75-83°F)

p.H.

6.0-7.5.

IUCN Red List

Rhyacoglanis paranensis is broadly distributed throughout the upper Paraná River basin in São Paulo, Minas Gerais, Paraná and Mato Grosso do Sul states, Brazil. Extent of occurrence (EOO) is estimated to be 213,296 km2. Continuing declines in habitat quality are inferred, based on broad land-use changes associated with urbanisation, industrialisation, agricultural production, cattle ranching, and hydroelectric dam infrastructure. However, this species is not rare where it has been reported and there is no indication of major range-wide population decline. Therefore, R. paranensis is assessed as Least Concern, (IUCN 2021).

Reference:

Lyons, T.J. 2021. Rhyacoglanis paranensis. The IUCN Red List of Threatened Species 2021.
Sands, David; pers. comm.
Shibatta, Oscar Akio, & Vari, Richard P. (2017). A new genus of Neotropical rheophilic catfishes, with four new species (Teleostei: Siluriformes: Pseudopimelodidae). Neotropical Ichthyology, 15(2), e160132. Epub June 12, 2017.

Family: Pseudopimelodidae Back to Ident-A-Cat Click on Thumbnails

Rhyacoglanis paranensis

Rhyacoglanis paranensis
Dorsal view

Rhyacoglanis paranensis
Magda São Paulo, Brazil

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