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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 kwarup, from the upper Rio Xingu basin, is most similar to R. bristkii. The morphological differences found between these two species are the colour pattern, which has more broken marks, creating a mottled appearance in the former, while R. britskii has the body bars and head marks more unbroken, causing a clearer pattern, and the number of oral teeth, as R. kwarup has 28–34 (mode 32) premaxillary and 27–33 (mode 29) dentary teeth, while all analyzed populations of R. britskii have 15–29 (mode 23) premaxillary and 15–29 (mode 20 and 25) dentary teeth, see Tabs. 1 and 2 for tooth count distribution. These counts are not fully discrete and partially overlap, and this species should probably be included in a wide molecular assessment of P. britskii populations. Rhinotocinclus kwarup was tentatively categorized as Least Concern (LC) by Lehmann, Reis, (2021) 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 kwarup.

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Parotocinclus kwarup

Loricariidae

South America: In the tributaries of the upper Rio Xingu in the state of Mato Grosso, Brazil. Type Locality: Couto de Magalhães River near Vila São José do Couto, Campinápolis, MT, Brazil [13°50’17”S 53°03’53”W].

3.0cm. (1¼ins)

23-26°c (73-79°f.)

6.5-7.2.

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.