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Mitsuhiro Iwamoto (3)

A new genus has been erected, Rhinotocinclus, (2022) with the type species of Parotocinclus longirostris Garavello, 1988. Description: Rhinotocinclus chromodontus is distinguished from congeners, except R. acuen, R. jumaorum, and R. dinizae, by having the dominant colour pattern formed by a dark stripe from the snout tip, through the eye and extending to end of caudal peduncle (vs. dominant colour pattern formed by dark bars separated and distinct, or dark bars wide and partially coalesced or closed together), and by having a V-shaped light mark from the snout tip to each nostril (vs. light mark absent, Y-shaped or present as two separate lines from snout tip diverging to each nostril). It is also distinguished from congeners, except R. acuen, R. hera, R. jumaorum, and R. dinizae, by lacking an adipose fin or platelets at the adipose-fin position (vs. adipose fin or platelets present). Rhinotocinclus chromodontus is distinguished from R. acuen, R. jumaorum, and R. dinizae by having the caudal fin mostly brown, with two hyaline spots on upper and lower lobes (vs. caudal fin with a dark blotch at base and two irregular dark bands), and from R. acuen, R. dinizae, R. hera by having the oral teeth reddish brown (vs. teeth light ochre). It is further distinguished from R. acuen, R. dinizae, R. hera, and R. jumaorum by the dorsal and pectoral-fin spines homogeneously dusky (vs. spines with 2–3 dark dots) (Reis & Lehmann 2022). Habitat: Found in flat areas in creeks of headwaters of Rio Tapajós in places of shallow clear waters with low current and sandy substrate. The holotype of this species was encountered in a creek severely altered by human activities; alongside a trail with very shallow water, the margin deprived of vegetation at the opposite side of swampy area, where vegetation was mainly represented by Tipha and Grammineae. Etymology: Rhinotocinclus masc., from the Greek ????s (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 chromodontus, From the Greek chroma (colour), and odontos (tooth), in reference to the reddish-brown tip of teeth of this species. Remarks: Most online searches at the moment (2022) will still give you the old genus name of Hisonotus.

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Hisonotus chromodontus

Loricariidae

South America: Upper rio Tapajós basin, in the state of Mato Grosso. Type locality: Brazil: Mato Grosso State: Diamantino, creek number 1, tributary of Rio Preto, on road to São Francisco, Rio Arinos drainage, ca. 14°18’S 56°20’W.

3.0cm. (1¼ins)

26-29°c (79-85°f.)

6.5-7.5.

Britski, H.A. and J.C. Garavello, 2007. Description of two new sympatric species of the genus Hisonotus Eigenmann and Eigenmann, 1889, from upper Rio Tapajós, Mato Grosso state, Brazil (Pisces: Ostariophysi: Loricariidae). Brazilian Journal of Biology.
Froese, R. and D. Pauly. Editors. 2022. FishBase. World Wide Web electronic publication. www.fishbase.org, ( 02/2022 ).
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.