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Shibatta et al (4)

Description: Rhyacoglanis varii has the posterior tip of the post-cleithral process reaching vertical through the base of the dorsal-fin spine (vs. not reaching in R. epiblepsis and R. rappydanielae). Rhyacoglanis varii differs from R. paranensis by the longer distance of anus to anal-fin origin (mean = 11.4±0.8% vs. 10.0±1.4% SL), maxillary barbel length (mean = 79.6±5.8% vs. 74.8±8.7% SL), and caudal peduncle depth (mean = 9.5±0.5% vs. 8.8±0.5% SL); minor posterior nostril to eye distance (mean = 4.8±0.9% vs. 6.7±1.3% SL), body depth (mean = 18.2±1.5% vs. 21.4±2.6% SL), and postcleithral process length (mean = 12.9±1.1% vs. 13.9±1.2% SL). Rhyacoglanis varii differs from R. pulcher and R. seminiger by the shape of the pectoral-fin spine, with anterior serrae distributed along the entire margin (vs. restricted to the proximal half) (Shibatta et al). Habitat: Rhyacoglanis varii is known only from the upper rio Tocantins basin on the Brazilian shield. Colouration: Rhyacoglanis varii is easily distinguished from congeners (except for R. pulcher) by the colour pattern, with the dark brown vertical bar below the dorsal-fin base not confluent with a dark brown bar below the adipose-fin base (vs. broadly confluent in R. seminiger), the subdorsal dark brown bar becomes abruptly thinner ventrally (vs. broader in R. paranensis), dark brown spots sparsely distributed on the body (vs. dense in R. epiblepsis and R. rapppydanielae), and a solid dark brown bar on caudal peduncle (vs. becoming light brown inside, resembling a circle, in R. annulatus) (Shibatta et al). 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 species name varii honours the ichthyologist Richard P. Vari (1949–2016) for his outstanding contributions to the systematics of Neotropical fishes.

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Pseudopimelodidae

South America: Upper rio Tocantins basin on the Brazilian shield. Type Locality: Rio do Peixe, upper Rio Tocantins basin, Goianésia, state of Goiás, Brazil.

6.5cm. (2¾ins)

24-28°C (75-83°F)

6.0-7.5.

Shibatta OA, Souza-Shibatta L. New species of Rhyacoglanis (Siluriformes: Pseudopimelodidae) from the upper rio Tocantins basin. Neotropical Ichthyology. 2023; 21(1):e220075.