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