Cat-eLog Right Pseudopimelodidae Right Rhyacoglanis  |  | 

Down Cat-eLog Data Sheet
Scientific Name Rhyacoglanis seminiger  Shibatta & Vari, 2017
Common Name
Type Locality Rio Juruena, Pequena Central Hidrelétrica Cidezal, rio Tapajós basin, Sapezal, Mato Grosso, Brazil, 13°22'39"S, 59°00'57"W.
Etymology Rhyacoglanis, from the Greek rhyax = torrent + glanis = catfish; indicating a catfish inhabiting running waters in reference to the habitat of the genus. Gender masculine. The specific epithet seminiger, adjective from the Latin semi = half + niger = black, referring to the dramatically contrasting light vs. dark body color pattern.
Down Species Information
Size 78mm or 3.1" SL. Find near, nearer or same sized spp.
Identification Rhyacoglanis is distinguished from other Pseudopimelodidae 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. A key to the species is located HERE.

Rhyacoglanis seminiger differs from all congeners by having a fusion of the dark subdorsal and subadipose bands, creating a broad uniformly-dark area across most of the body (vs. distinct subdorsal and subadipose bands with a pale space separating them).
Down Habitat Information
Distribution South America: Rio Tapajós basin, Mato Grosso, Brazil.
Amazon, Lower Amazon, Tapajós, Upper Tapajós, Juruena (click on these areas to find other species found there)

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IUCN Red List Category Least Concern, range map and more is available on the IUCN species page. Last assessed 2020.
Other Parameters Little is known of these fish in the aquarium. Provide good aeration; modest current may be beneficial.
Down Husbandry Information
Furniture See general remarks. Rhyacoglanis likely prefer well-aerated water with significant current over a substrate of rocks, pebbles and sand.
Breeding Unreported.
Breeding Reports There is no breeding report.
Down Further Information
Reference Neotropical Ichthyology v. 15 (no. 2) e160132, pp 17, Figs. 3e, 11, 12.
Registered Keepers There is no registered keeper.
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Last Update 2023 Jul 27 09:10 (species record created: 2017 Jun 13 08:24)