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Rhinotridens britskii de Pinna M, Reis V, Pastana MNL, Datovo A., 2024 |
Image contributors to this species: |
de Pinna M, et al 2024 (3) Flávio C. T. Lima (1) |
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Other Sources: |
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Relevant Information: |
Abstract: A new species of the recently discovered miniature tridentine catfish, Rhinotridens, is described from the Amazon basin in Brazil, Colombia, and Peru. It differs from Rhinotridens chromocaudatus, type-species of the genus, in having the caudal fin mostly hyaline, a rictal barbel vestigial or externally absent, a longer anal fin with 22–29 segmented rays, and numerous other features from the skeleton. An osteological account of the new species is provided based on cleared and stained specimens, and traits of its external morphology are revealed through scanning electron microscopy (SEM), which for the first time reveal details of the lip structure of tridentines. The seven morphological characters previously listed as synapomorphies for Rhinotridens are confirmed in the species described herein, corroborating its generic allocation. An additional characteristic from the morphology of the lateral process of the autopalatine is proposed as a novel synapomorphy for the genus (de Pinna M, et al 2024). Etymology: The genus name Rhinotridens: From rhino, latinised form of the Greek word rhinos (pivós), meaning nose or snout, and Tridens, the type genus of the subfamily. In allusion to the rostral protuberance of the new genus. An adjective. The specific name of britskii: Named in honour of Heraldo Britski, first collector of specimens of the new species, in recognition of his pivotal role in the development of ichthyology in Brazil and also as a token of his 90th birthday in 2024. A noun in a genitive case. Remarks: Rhinotridens britskii is spread over a large geographic range, including localities in Brazil (rio Purus, rio Madeira, and Ati-Paraná), in Colombia (Río Loreto-Yacco) and in Peru (Río Yanayacu). No significant threats to the species have been identified in its area of occurrence. Thus, we believe R. britskii can be provisionally classified as Least Concern (LC) according to the categories and criteria of the International Union for Conservation of Nature (IUCN Standards and Petitions Committee, 2022), (de Pinna M, et al 2024). |
Common Name: |
None |
Synonyms: |
None |
Family: |
Trichomycteridae |
Distribution: |
South America: Brazil (Rio Purus, Rio Madeira, and Ati-Paraná), in Colombia (Río Loreto-Yacco) and in Peru (Río Yanayacu). |
Size: |
1.5cm. (1¼ins) |
Temp: |
22-26°c (71-79°f.) |
p.H. |
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6.0-7.0. |
Reference: |
de Pinna M, Reis V,
Pastana MNL, Datovo A. A new species of the
tridentine Rhinotridens from the Amazon basin (Siluriformes:
Trichomycteridae). Neotrop Ichthyol. 2024; 22(2):e240025. |
Family: Trichomycteridae Back to Ident-A-Cat Click on Thumbnails |
Rhinotridens britskiiBrazil, Amazonas State, Igarapé Boa Vista (Rio Purus drainage) |
 Rhinotridens
britskiiDorsal view-Brazil, Amazonas State, Igarapé Boa Vista (Rio Purus drainage) |
 Rhinotridens
britskiiVentral view-Brazil, Amazonas State, Igarapé Boa Vista (Rio Purus drainage) |
 Rhinotridens
britskiiType locality-igarapé Boa Vista (Rio Javari drainage), Atalaia do Norte Municipality |
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