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Reis & Lehmann 2022 (3)

A new genus has been erected, Rhinotocinclus, (2022) with the type species of Parotocinclus longirostris Garavello, 1988. Abstract: A new genus of Hypopopomatinae armored catfish is described from the northern portions of South America, namely the Amazon, Orinoco and Guianan coastal drainages. The new genus is diagnosed from all remaining hypoptopomatines by having the canal cheek plate on the ventral surface of the head posteriorly elongated and contacting the cleithrum, in addition to other features that distinguish the new genus from specific genera. Five new species are described and 18 species currently allocated in Parotocinclus, Hisonotus, and Curculionichthys are transferred to the new genus and rediagnosed. Parotocinclus amazonensis and P. aripuanensis are considered junior synonyms of P. britskii. The secondary sexual dimorphism of the members of the new genus is detailed and illustrated. Morphological characters are used to delimit four phenotypic groups of species that might have phylogenetic significance, which still have to be properly tested. A key to the species is offered and diagnoses, illustrations, and distribution maps are provided for all species (Reis & Lehmann 2022). Description: Rhinotocinclus hardmani is sympatric and syntopic with R. collinsae in the Potaro River, having been collected together at the same spot. Despite both species are superficially similar, they have many distinguishing characters. Rhinotocinclus hardmani is easily diagnosed from R. collinsae by having few and minute teeth accessory teeth, while they are numerous and large in R. collinsae, by the large urogenital papilla of males, which is 3–4 times bigger than that of R. collinsae, by males lacking a skin flap on first pelvic-fin ray, which is present in R. collinsae, by having the belly naked or almost naked between lateral abdominal plates, while it is fully plated in R. collinsae, and by having the adipose-fin spine coalesced to the dorsum, while it is free from the dorsum on R. collinsae. Rhinotocinclus hardmani was tentatively categorised as Least Concern (LC) by Lehmann et al., (2022) in the original description. (Reis & Lehmann 2022). Etymology: Rhinotocinclus masc., from the Greek (Rhinos), beak, snout and Otocinclus, a genus of Hypoptopomatinae, in allusion to the conspicuous and elegant snout of most of its species. Remarks: Most online searches at the moment (2022) will still give you the old genus name of Parotocinclus hardmani.

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Parotocinclus hardmani

Loricariidae

Soth America: Potaro River, Essequibo River basin in the Region of Potaro-Siparuni, Guyana. Type locality: Kuribrong River at Grass Shoals Rapids, Potaro-Siparuni, Guyana, 05°28’44.7”N 59°31’54.4”W.

3.0cm. (1¼ins)

24-27°c (75-81°f.)

5.5-6.5.

Reis RE, Lehmann A. P. A new genus of armored catfish (Siluriformes: Loricariidae) from the Greater Amazon, with a review of the species and description of five new species. Neotrop Ichthyol. 2022.