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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 bockmanni is distinguished from all congeners, except for R. dani, R. hera, R. pentakelis, R. marginalis n. sp., and R. loxochelis n. sp. by having the dominant colour pattern formed by dark bars on body well separated and distinct (vs. dominant colour pattern formed by wide dark bars partially coalesced or closed together, or formed by a dark stripe from the snout tip, through the eye and extending to end of caudal peduncle); having two separate light lines from snout tip diverging to each nostril (vs. light lines on snout absent, Y- or V-shaped); and by having teeth with yellow cusps (vs. cusps brown or light ochre). Rhinotocinclus bockmanni is further distinguished from R. britskii, R. kwarup, R. eppleyi, R. longirostris, R. polyochrus, R. variola, R. yaka, R. discolor, R. isabelae, and R. pilosus by lacking an adipose fin (vs. adipose fin present). Rhinotocinclus bockmanni is further distinguished from congeners, except R. dani, R. pentakelis, R. marginalis n. sp., and R. loxochelis n. sp., by having small platelets at adipose-fin position (vs. small platelets absent). Rhinotocinclus bockmanni is distinguished from R. dani, R. hera, R. pentakelis, R. marginalis n. sp., and R. loxochelis n. sp. by having a triangular dark spot at the dorsal-fin membrane (vs. dorsal-fin dark spot absent), and by lacking or having a very inconspicuous dark bar 2 on body (vs. bar 2 present and conspicuous) (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. The specific name is for Flávio A. Bockmann, in appreciation for his guidance and his contributions to the knowledge of Neotropical catfishes. Remarks: Most online searches at the moment (2022) will still give you the old genus name of Hisonotus bockmanni.

None

Hisonotus bockmanni

Loricariidae

Soth America: Lower and middle Rio Tapajós basin, including the Rio Teles Pires in the state of Pará, Brazil. Type locality: Brazil, Pará State, Jacareacanga Municipality, sandbank at Rio Cururu, tributary to Rio Teles Pires, tributary to Rio Tapajós, 08°53’42.2”S 57°14’27.8”W, 140 m asl.

2.5cm. (1ins)

24-27°c (75-81°f.)

5.5-6.5.

Carvalho, M. and A. Datovo, 2012. A new species of cascudinho of the genus Hisonotus (Siluriformes: Loricariidae: Hypoptopomatinae) from the Upper Rio Tapajós Basin, Brazil. Copeia 2012(2):266-275
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.