Trichomycterus venulosus (Steindachner, 1915), a junior synonym of Eremophilus mutisii Humboldt, 1805 (Siluriformes: Trichomycteridae) and not an extinct species

DoNascimiento, Carlos; Prada-Pedreros, Saúl; Guerrero-Kommritz, Jürgen

doi:10.1590/1982-0224-20130236

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Articles • Neotrop. ichthyol. 12 (4) • Oct-Dec 2014 • https://doi.org/10.1590/1982-0224-20130236 linkcopy

Trichomycterus venulosus (Steindachner, 1915), a junior synonym of Eremophilus mutisii Humboldt, 1805 (Siluriformes: Trichomycteridae) and not an extinct species

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Reexamination of the syntypes of the enigmatic Trichomycterus venulosus, described from Páramo de Cruz Verde, Eastern Cordillera of Colombia, allowed us to assess its actual taxonomic status. This nominal species is demonstrated to constitute a junior synonym of Eremophilus mutisii, and then not represents a case of extinction of a fish endemic to Colombia, as currently accepted.

Catfish; Páramo de Cruz Verde; Pelvic-less; Taxonomy; Trichomycterinae

Characters	Trichomycterus venulosus	Eremophilus mutisii	Trichomycterus sp. A (Páramo de Cruz Verde)
Premaxilla shape	Anterior margin extending more laterally than posterior margin, forming a conspicuous pointed lateral projection. Lateral margin slightly concave	Anterior margin extending more laterally than posterior margin	Anterior margin not extending more laterally than posterior margin. Lateral margin convex. Second and third teeth rows extending slightly more laterally than anterior and posterior rows
Premaxilla relative length	Similar to maxilla	Premaxilla equal or slightly shorter than maxilla	Longer than maxilla
Autopalatine	Posterolateral process extending posteriorly to anguloarticular articulation with quadrate	Posterolateral process extending posteriorly to anguloarticular articulation with quadrate. Lateral margin slightly convex	Posterolateral process forming a conspicuous angle with the lateral margin
Branchiostegal rays	8	7-8	6-7
Pectoral-fin rays	8	8	8-9
Precaudal vertebrae	17	17-18	9-13
Caudal vertebrae	25	25	27-32
Ribs	18	16-18	14-18
First hemal spine	Vertebra 19	Vertebra 19	Vertebrae 16-19
Dorsal-fin rays	13	13-14	11-13
Dorsal-fin basal radials	10	10	8
Dorsal-fin insertion	Vertebrae 21-27	Vertebrae 21-27	Vertebrae 18-23; 18-24; 19-24
Anal-fin rays	11	11	11-12
Anal-fin basal radials	8	8	6-7
Anal-fin insertion	Vertebrae 25-31	Vertebrae 25-31	Vertebrae 22-26; 23-27; 23-28; 24-28
Neural spine of compound caudal vertebra	Complete, ca. 1/3 of adjacent neural spine height	Complete, 1/3-1/2 of adjacent neural spine height	Complete, with a short rounded tip, and base having conspicuous broad anterior and posterior apophysis
Dorsal procurrent caudal-fin rays	13	13-16	16-21
Dorsal procurrent rays origin	Vertebra 6	Vertebrae 6-8	Vertebrae 7-10
Ventral procurrent caudal-fin rays	12	12-15	14-17
Ventral procurrent rays origin	Vertebra 6	Vertebrae 6-8	Vertebrae 8-10
Caudal skeleton	PH+1+2, 3, 4+5	PH+1+2, 3, 4+5	PH+1+2, 3+4+5

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Sociedade Brasileira de Ictiologia Neotropical Ichthyology, Departamento de Biologia Animal e Vegetal, CCB, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, Km 380, Cidade Universitária, 86055-900, Londrina, Paraná, Brazil, Phone +55(43)3371-5151 - Londrina - PR - Brazil
E-mail: neoichth@nupelia.uem.br

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