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Rhinotridens chromocaudatus Datovo A, Ochoa L, Vita L, Presti P, Ohara WM, de Pinna MCC., 2023 |
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Abstract: A new miniature tridentine catfish is described from the Rio Purus drainage, Amazon basin, Brazil. It differs from all other tridentines in having several unique autapomorphies: conspicuous anteromedial protuberance in the snout; set of symphyseal premaxillary and dentary teeth inclined posteromedially; distal process of the hyomandibula directed anteriorly; rod-like orbitosphenoid ossified only ventral to the optic nerve; mesethmoid cornua inclined ventrolaterally; opercular and interopercular odontodophores separated by a large interspace; basipterygia fused sagittally; and conspicuous dark brown horizontal stripe in the middle of the caudal fin. The new taxon is hypothesised to be sister to the clade formed by Tridensimilis and Tridens. A detailed osteological description of the new taxon is provided based on X-ray microcomputed tomography (µCT-scans) data and on cleared and stained specimens. Our analysis also reveals that “Tridens” brevis, an enigmatic species that has been indecisively assigned to three different tridentine genera over the past 134 years, belongs to Tridentopsis. Consequently, Tridensimilis is a monotypic genus that currently includes only T. venezuelae (Datovo A., et al 2023). Etymology: 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 chromocaudatus: From chroma, latinised from of the Greek word khrôma (xpwµa), meaning colour, and cauda, a Latin word meaning tail. In reference to the presence of the dark brown pigmentation in the middle of the caudal fin. An adjective. (Datovo A., et al 2023). Remarks: Rhinotridens chromocaudatus was captured in localities of the lower Rio Purus, including within the Floresta Estadual Tapauá and Reserva Sustentável Piagaçu-Purus. No significant threats to the species have been identified in the area of occurrence. Consequently, R. chromocaudatus can be provisionally classified as Least Concern (LC) according to the categories and criteria of the International Union for Conservation of Nature (Datovo A., et al 2023). |
Common Name: |
None |
Synonyms: |
None |
Family: |
Trichomycteridae |
Distribution: |
South America: Rio Ipixuna, Rio Purus drainage, Rio Amazonas basin, Humaitá Municipality, Amazonas State, Brazil. |
Size: |
1.5cm. (1¼ins) |
Temp: |
22-26°c (71-79°f.) |
p.H. |
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6.0-7.0. |
Reference: |
Datovo A, Ochoa L,
Vita L, Presti P, Ohara WM, de Pinna MCC.
A new genus and species of miniature tridentine catfish
from the Amazon basin (Siluriformes: Trichomycteridae).
Neotrop Ichthyol. 2023; 21(3). |
Family: Trichomycteridae Back to Ident-A-Cat Click on Thumbnails |
Rhinotridens chromocaudatusRio Ipixuna, tributary of the Rio Purus, Rio Solimões basin, Brazil |
 Rhinotridens
chromocaudatusDorsal view-Rio Ipixuna, tributary of the Rio Purus, Rio Solimões basin, Brazil |
 Rhinotridens
chromocaudatusVentral view-Rio Ipixuna, tributary of the Rio Purus, Rio Solimões basin, Brazil |
 Rhinotridens
chromocaudatusType locality-Rio Ipixuna, Rio Purus drainage, Rio Amazonas basin, Humaitá Municipality, Amazonas State, Brazil |
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