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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. Description: Rhinotocinclus longirostris is distinguished from R. acuen, R. bockmanni, R. chromodontus, R. dani, R. dinizae, R. hera, R. jumaorum, R. pentakelis, R. marginalis n. sp., and R. loxochelis n. sp. by possessing an adipose fin (vs. adipose fin absent), and by having a Y-shaped light mark from the snout tip to each nostril (vs. light mark V-shaped or present as two separate lines from snout tip diverging to each nostril). It is distinguished from R. collinsae, R. halbolthi, and R. hardmanni by lacking accessory teeth on both premaxilla and dentary (vs. accessory teeth present); the odontodes on the ventral surface of first pelvic-fin ray bent and pointing mesially (vs. odontodes aligned with main ray axis,); a triangular dark spot on the anterior portion of the dorsal-fin membrane (vs. dorsal-fin spot absent); a Y-shaped light mark from snout tip to nostrils (vs. light mark absent); and a larger orbit, 26.7–31.4% snout length (vs. orbit 18.9–24.6% snout length). Rhinotocinclus longirostris is distinguished from R. britskii and R. kwarup, by having the snout more acutely pointed (vs. snout more broadly rounded, Fig. 11A); dark bars on body wider and closer together (vs. dark bars on body narrower and more widely spaced,); and 2–3 plates between the posterior border of the rostral plate and the nostril (vs. one plate). Rhinotocinclus longirostris is distinguished from R. variola, R. yaka, R. discolor n. sp., R. isabelae n. sp., and R. pilosus n. sp. by having 4–5 irregular series of middle abdominal plates (vs. 0–2, rarely 3 irregular series); and five dark bars on body (vs. four dark bars on body [bars 1+2 or 2+3 fused], Fig. 7C). It is distinguished from R. eppleyi by having more numerous premaxillary, 28–36 (mode 30) and dentary, 27–31 (mode 30) teeth (see Tabs. 1–2, vs. fewer premaxillary (22–30, mode 26) and dentary (21–27, mode 25) teeth) (Reis & Lehmann 2022). Habitat: Occurs in tributaries to the central Amazon, including the Madeira and Negro basins, in the states of Amazonas, Rondônia, and Roraima, Brazil. 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 of longirostris, points to the long snout of this species. Remarks: Most online searches at the moment (2022) will still give you the old genus name of Parotocinclus longirostris. Rhinotocinclus longirostris, listed as Parotocinclus longirostris, is currently assessed as Least Concern (LC) in the Brazilian regional assessment by ICMBio, (2018) and in the global assessment by IUCN (Red List).

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Parotocinclus longirostris

Loricariidae

South America: Amazon River basin. Type locality: Rio Preto da Eva, Manaus-Itacoatiara highway, km 80, Manaus, [Amazonas, Brazil].

3.0cm. (1¼ins)

24-27°c (75-81°f.)

6.0-7.5.

Froese, R. and D. Pauly. Editors. 2022. FishBase. World Wide Web electronic publication. www.fishbase.org, ( 07/2022 ).
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.
Schaefer, S.A. and F. Provenzano, 1993. The Guyana Shield Parotocinclus: systematic, biogeography, and description of a new Venezuelan species (Siluroidei: Loricariidae). Ichthyol. Explor. Freshwat. 4(1):39-56