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Crispim-Rodrigues et al (3)

Description: Rhyacoglanis beninei can be diagnosed from all congeners by two oblique dorsal dark brown bars on the predorsal region (vs. absent). Additionally, R. beninei is distinguished from some congeners by having a dorsal confluence between the dark subdorsal and subadipose bands in large juveniles and adults (> 28 mm SL) (vs. lack dorsal confluence in R. paranensis, R. annulatus, R. varii, and R. rapppydanielae); ventral confluence between the dark subadipose and caudal peduncle bands (vs. lack ventral confluence in R. annulatus, R. epiblepsis, R. paranensis, R. seminiger, and R. rapppydanielae); body without conspicuous dark brown spots (vs. conspicuous dark brown spots in R. epiblepsis and R. rapppydanielae); complete dark band on caudal peduncle (vs. caudal peduncle-band with a unpigmented central region in R. annulatus); body with three dark bands (vs. two dark bands in R. seminiger); a thin dark caudal-fin bands (vs. large caudal-fin bands in R. paranensis and R. epiblepsis); pectoral-fin spine with anterior serrae distributed along the entire margin (restricted to the proximal half in R. pulcher and R. seminiger); 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. rapppydanielae); hypural 5 free of hypural 3 and 4 (vs. hypurals 4 and 5 fused in R. rapppydanielae); pointed caudal-fin lobes (vs. rounded lobes in R. epiblepsis), (Crispim-Rodrigues et al). Habitat: Rhyacoglanis beninei is known only from the type locality in the Jamanxim River, Tapajós River basin, Brazil The new species was collected in fast-flowing currents of Córrego Jussara, characterized by clear water and the bottom with rocks and gravels, (Crispim-Rodrigues 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: Named in honour of Ricardo Cardoso Benine, Professor at Universidade Estadual Paulista “Júlio de Mesquita Filho”, in recognition of his dedication and remarkable contributions to the knowledge of Neotropical freshwater fishes (Crispim-Rodrigues et al). Remarks: This brings the genus to nine valid species, plus one undescribed species Rhyacoglanis sp. “Xingu” (which is closely related to Rhyacoglanis beninei, and no doubt more of these lovely catfishes to be discovered in the future (Fish in the News).

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Pseudopimelodidae

South America: Brazil, Jamanxim River, Tapajós River basin.

6.0cm. (2½ins)

24-28°C (75-83°F)

6.0-7.5.

Crispim-Rodrigues JL, Silva GSC, Shibatta OA, Kuranaka M, Oliveira C. Description and phylogenetic position of a new species of Rhyacoglanis (Siluriformes: Pseudopimelodidae) from the Jamanxim River basin. Neotrop Ichthyol. 2023; 21(3):e230051.
Fish in the News 2023.