Fig. 1.
Pectoral girdle of: a. Trichomycterus steindachneri (MBUCV-V-35652), paratype, 86.7 mm SL. b. T. cachiraensis (MBUCV-V-35384), paratype, 74.9 mm SL. Ventral view. Abbreviations: cl, cleithrum; pcr, pectoral complex radial; pr, pectoral radial; sco, scapulocoracoid.
Fig. 2.
Neurocranium, Weberian complex, and right suspensorium and opercular series of: a. Trichomycterus steindachneri (MBUCV-V-35652), paratype, 86.7 mm SL. b. T. cachiraensis (MBUCV-V-35384), paratype, 74.9 mm SL. Dorsal view. Abbreviations: afo, anterior fontanel; apa, autopalatine; epo, epioccipital; fr, frontal; la, lachrymal-antorbital; le, lateral ethmoid; hy, hyomandibula; i1, infraorbital sensory pore 1; i3, infraorbital sensory pore 3; i10-11, infraorbital sensory pores 10 and 11; me, mesethmoid; mto, metapterygoid; mx, maxilla; op, opercle; pfo, posterior fontanel; pmx, premaxilla; pop, preopercle; pr, preopercular sensory pore; psoc, parieto-supraoccipital; pt, pterotic; ptb, pterotic branch; pttsc, posttemporo-supracleithrum; q, quadrate; s1, supraorbital sensory pore 1; s3, supraorbital sensory pore 3; s6, supraorbital sensory pore 6 (epiphyseal branch); sob, sesamoid supraorbital; sp+pro+pts, sphenotic-prootic-pterosphenoid complex bone; wc, Weberian capsule.
Fig. 3.
Caudal skeleton (caudal-fin rays not illustrated) of: a. Trichomycterus steindachneri (MBUCV-V-35652), paratype, 86.7 mm SL. b. T. cachiraensis (MBUCV-V-35384), paratype, 74.9 mm SL. Left lateral view. Abbreviations: h1-5, hypurals 1 to 5; ph, parhypural; pu1+u1, compound caudal centrum (preural centrum 1 plus ural centrum 1); un, uroneural.
Fig. 4.
Trichomycterus steindachneri, holotype, MPUJ 4191, 143.5 mm SL; Colombia, Cundinamarca, Ubaque, vereda Pueblo Nuevo, quebrada El Charco, tributary of quebrada Santa Bárbara, río El Palmar system, río Orinoco basin, 04°31'10.3"N 73°58'44.6"W, 2700 m. Scale bar = 1 cm.
Fig. 5.
Trichomycterus steindachneri, paratype, MBUCV-V-35652, 88.8 mm SL, Colombia, Cundinamarca, Ubaque, Vereda Pueblo Nuevo, quebrada El Charco, tributary of quebrada Santa Bárbara, río El Palmar system, río Orinoco basin. 04°31'10.3"N 73°58'44.6"W, 2700 m. Scale bar = 1 cm.
Fig. 6.
Map of Middle Eastern region of Colombia showing the geographic distribution of Trichomycterus steindachneri (circle): Cundinamarca, Ubaque, vereda Pueblo Nuevo, quebrada El Charco, 04°31'10.3"N 73°58'44.6"W, T. dorsostriatus (square): Meta, Villavicencio, 04°09'12"N 73°38'06"W and T. migrans(triangle): Meta, Serranía La Macarena, tributary creek of río Guayabero, 02°28'21"N 73°35'43"W. Inset at lower left corner corresponds to enlargment of distribution region of T. steindachneri.