AquaticRepublic.com - Rhyacoglanis seminiger (Pseudopimelodidae) All Fishes

Holotype, 74.2 mm SL
Holotype, dorsal view
Holotype, ventral view
Color variation. SL: a. 70.4, b. 48.6, c. 44.4 mm
Pectoral spine, dorsal view. Bar = 2mm

All Fishes 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.
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).
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) Login to view the map.
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.
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.
Further Information
Reference	Neotropical Ichthyology v. 15 (no. 2) e160132, pp 17, Figs. 3e, 11, 12.
Registered Keepers	There is no registered keeper.
Wishlists	Love this species? Click the heart to add it to your wish list. There is no wish to keep this species.
Spotters	Spotted this species somewhere? Click the binoculars! There is no record of this fish being seen.
Forum BBCode

	Look up R. seminiger on PlanetCatfish.com
	Look up R. seminiger on Fishbase
	Look up R. seminiger on Encyclopedia of Life
	Look up R. seminiger on Global Biodiversity Information Facility
	LFS label creator ARN ref:1.31.1297.6998
Last Update	2025 Jan 01 12:22 (species record created: 2017 Jun 13 08:24)