Rhinotridens, Datovo & Ochoa & Vita & Presti & Ohara & Pinna, 2023

Datovo, Alessio, Ochoa, Luz, Vita, George, Presti, Paulo, Ohara, William M. & Pinna, Mario C. C. de, 2023, A new genus and species of miniature tridentine catfish from the Amazon basin (Siluriformes: Trichomycteridae), Neotropical Ichthyology (e 230076) 21 (3), pp. 1-22 : 4-5

publication ID	https://doi.org/ 10.1590/1982-0224-2023-0076
publication LSID	lsid:zoobank.org:pub:944B7F55-DAA4-4CD0-B436-8F1100D68947
persistent identifier	https://treatment.plazi.org/id/B42D87D6-E148-FFE9-FCC9-BFC2FC1B3B15
treatment provided by	Felipe
scientific name	Rhinotridens
status	gen. nov.

Treatment

Rhinotridens , new genus urn:lsid:zoobank.org:act:4366BE6C-08F2-4BC1-9FBD-8D0B28E5B540

Type-species. Rhinotridens chromocaudatus , new species.

Diagnosis. Rhinotridens is distinguished from all other tridentine genera by the following unique autapomorphies: presence of a conspicuous anteromedial protuberance on the snout, with a length greater than 35% of its width ( Fig. 1 View FIGURE 1 ; vs. protuberance absent or limited to a discreet convexity with a length less than 18% of its width; see Baskin, 1973: fig. 66; Henschel et al., 2023: figs. 2, 8, 12, 13); set of symphyseal premaxillary and dentary teeth inclined posteromedially ( Fig. 2 View FIGURE 2 ; vs. not inclined, see Azpelicueta, 1990: figs. 2, 3; Henschel et al., 2023: fig. 9); rod-like orbitosphenoid ossified only ventral to the optic nerve ( Fig. 3 View FIGURE 3 ; vs. laminar bone ossified around the optic nerve, with a foramen for its exit, see Baskin, 1973: figs. 28, 29; Henschel et al., 2023: fig. 3); mesethmoid cornua inclined ventrolaterally ( Fig. 4 View FIGURE 4 ; vs. cornua horizontally straight); distal process of the hyomandibula directed anteriorly ( Fig. 5 View FIGURE 5 ; vs. posteriorly, see Baskin, 1973: fig. 51; Henschel et al., 2017: fig. 2g; Henschel et al., 2023: fig. 4); opercular and interopercular odontodophores separated by a large interspace, greater than the depth of the opercular patch ( Fig. 5 View FIGURE 5 ; vs. patches nearly juxtaposed, separated by a distance less than the depth of the opercular patch, see Baskin, 1973: fig. 51; Azpelicueta, 1990: fig. 4; Henschel et al., 2017: fig. 2g; Henschel et al., 2023: fig. 4); and basipterygia fused sagittally ( Fig. 6 View FIGURE 6 ; vs. separated).

Etymology. From rhino, latinized form of the Greek word rhinos (ῥινός), meaning nose or snout, and Tridens , the type genus of the subfamily. In allusion to the rostral protuberance of the new genus. An adjective.