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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 jumaorum was also described as a member of Hisonotus by Dias et al., (2018), disregarding the study of Calegari et al., (2017) which redefined Hisonotus and restricted its distribution to the La Plata basin and coastal rivers from Uruguay to Espirito Santo State, Brazil. For this reason, and based on the fact that Hisonotus jumaorum shares some diagnostic features of Curculionichthys and is distributed in Amazon tributaries running on the Brazilian Shield, Calegari et al., (2018) reallocated the species as Curculionichthys jumaorum. Roxo et al., (2019), however, transfered the species back to Hisonotus. Extintion risk of Rhinotocinclus jumaorum is currently not assessed (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 jumaorum or Curculionichthys jumaorum.

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Hisonotus jumaorum, Curculionichthys jumaorum

Loricariidae

Soth America: Occurs in the Rio Juma, a small tributary to the Rio Aripuanã and the Rio Acari, a tributary to the rio Canumã, Rio Madeira basin, in state of Amazonas, Brazil.

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.