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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: Another species originally described as Hisonotus, it was compared to congeners and diagosed as “Hisonotus dinizae differs from all congeners, except H. acuen, H. bockmanni, H. chromodontus, H. jumaorum and H. vespuccii by having a V-shaped spinelet...”. Except for H. vespuccii, which is probably a member of Otothyropsis, all remaining species are now transferred to Rhinotocinclus and the functional V-shaped spinelet indeed diagnoses R. dinizae, as well as all Rhinotocinclus and Curculionichthys species, from Hisonotus. Extintion risk of Rhinotocinclus dinizae is currently not assessed. The holotype and MZUSP paratypes of Hisonous dinizae have never been sent to MZUSP after the species original description and were unavailable for the present study, possibly having been lost. Five paratypes (LBP 4932), however, were examined and compared to other Rhinotocinclus species. (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: Some online searches at the moment (2022) will still give you the old genus names of Hisonotus dinizae.

None

Hisonotus dinizae

Loricariidae

Soth America: Known from two localities in the upper Rio Araguaia near Barra do Garças, Mato Grosso State, Brazil. Type Locality: Brazil, Mato Grosso state, municipality of Barra do Garças, córrego Grande, drainage of Rio Pindaíba, Rio Araguaia basin, -15.7417 -52.0936 [15°44’30.12”S 52°05’36.96”W].

2.5cm. (1ins)

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.