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21 February 2008 Two New Species of Thicklip Thornycats, Genus Rhinodoras (Teleostei: Siluriformes: Doradidae)
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Abstract

Rhinodoras is newly diagnosed within Doradidae by its unique combination of coloration (sides darkly mottled, usually with wide dark bars, light midlateral stripe absent) and lip morphology (labial tissue thick, fleshy, considerably expanded at corners of mouth forming rounded flap-like extensions with entire margins, all surfaces rugose with low, rounded, and tightly spaced papillae, and distal margin of lower lip draped over bases of outer and inner jaw barbels, at times nearly encircling the latter). Three previously described species are considered valid, R. thomersoni (Lake Maracaibo basin), R. boehlkei (Amazonas), and R. dorbignyi (Paraguay–Paraná), and two new species are described. Rhinodoras armbrusteri from the Branco/Essequibo basins is diagnosed by having ventral surfaces with dark pigment, anterior midlateral plates moderately deep with dorsal and ventral wings subequal in depth, sum of midlateral plates 57–60, midlateral plates anterior to vertical through pelvic-fin origin usually five, tympanal portion of lateral-line canal moderately ossified with three distinct plates, postcleithral process moderately short and broad, adipose eyelid moderate to large, pectoral-fin rays usually eight, and one-part gas bladder. Rhinodoras gallagheri from the Orinoco basin is diagnosed by having ventral surfaces pale, anterior midlateral plates shallow to moderately deep with dorsal and ventral wings about equal in depth, midlateral plates anterior to vertical through pelvic-fin origin usually five, tympanal portion of lateral-line canal weakly ossified with two to three emergent plates, postcleithral process moderately long and narrow, adipose eyelid moderate to large, pectoral-fin rays usually eight, and one-part gas bladder. Rhinodoras is the only doradid genus with extant species in both trans- and cis-Andean drainages.

Se actualiza el diagnosis del género Rhinodoras dentro de la familia Doradidae en base a su patrón de coloración; éste que consiste en lo siguiente: costados oscuramente moteados, carencia de una franja media lateral clara, y generalmente posee tres franjas verticales oscuras; estos caracteres en combinación con una morfología labial especial que en tener el tejido labial grueso, carnoso, y expandido considerablemente en las esquinas de la boca para formar una solapa redondeada sin borde aserrados; la superficie de este tejido es rugosa, con papilas bajas, redondas y casi tocándose entre si; el margen distal del labio inferior pasa por encima de las bases de las barbillas mentonianas externas e internas, a veces casi encierran a éstas últimas. Se consideran válidas tres especies previamente descritas: R. thomersoni (cuenca del Lago de Maracaibo), R. boehlkei (Amazonas), and R. dorbignyi (Paraguay–Paraná), y se describen dos especies como nuevas. Rhinodoras armbrusteri del cuencas del Branco/Essequibo se distingue en poseer las superficies ventrales con pigmento oscuro, las placas laterales medias anteriores son moderadamente profundas y con las alas dorsales y ventrales desiguales en altura; la suma de los conteos de las placas medias laterales de ambos lados oscila entre 57 y 60; presenta cinco placas medias laterales anteriores hasta llegar al nivel del origen de las aletas pélvicas; la porción encima del tímpano del canal de la línea lateral está bien osificada y consiste de tres placas distintas; el proceso postcleitral es moderadamente corto y ancho; el ojo es de moderado a grande, los radios pectorales generalmente son ocho, y la vejiga natator

2008 by the American Society of Ichthyologists and Herpetologists
Mark H. Sabaj, Donald C. Taphorn, and Otto E. Castillo G "Two New Species of Thicklip Thornycats, Genus Rhinodoras (Teleostei: Siluriformes: Doradidae)," Copeia 2008(1), 209-226, (21 February 2008). https://doi.org/10.1643/CI-05-143
Received: 26 June 2005; Accepted: 1 September 2007; Published: 21 February 2008
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