Pygidianops Myers, 1944

de Pinna, Mário C. C. & Kirovsky, Alexandre L., 2011, A new species of sand-dwelling catfish, with a phylogenetic diagnosis of Pygidianops Myers (Siluriformes: Trichomycteridae: Glanapteryginae), Neotropical Ichthyology 9 (3), pp. 493-504 : 502

Pygidianops Myers, 1944

Type species: Pygidianops eigenmanni, Myers, 1944 .

Revised diagnosis. Glanapterygine trichomycterids uniquely diagnosed by a hypertrophied symphyseal joint and associated ligament in the lower jaw; an elongate, laterallydirected, process on the dorsal surface of the premaxilla; a rotated lower jaw, where the surface normally facing laterally in other glanapterygines is instead directed ventrally. Further distinguished from its closest relative, Typhlobelus , by the snout relatively short, not prolongued into a duck-bill shape; the presence of numerous teeth on each premaxilla ( vs. 1-4); the presence of well-differentiated (and partly ossified) basibranchials and hypobranchials ( vs. elements mostly undifferentiated or absent); the palatine large and oriented in parallel to the neurocranium ( vs. palatine small, club-shaped and oriented obliquely to the neurocranium); the posterior margin of the hyomandibula lacking a process ( vs. large pointed process posteriorly on posterior margin of hyomandibula); and the premaxilla articulating with the anterior end of the mesethmoid ( vs. articulating with the shaft of the mesethmoid). Further distinguished from Listrura and Glanapteryx by the presence of metapleural keels along the edges of abdomen, the reduction or lack of dark integument pigmentation and the presence of a long dorsal-fin fold extending along most of dorsal margin of body. Further distinguished from Listrura by the short pectoral fin, the absence of opercular and interopercular odontodes and the absence of dorsal fin.

Included species: P. eigenmanni Myers, 1944 ; P. cuao Schaefer, Provenzano, de Pinna & Baskin, 2005 ; P. magoi Schaefer, Provenzano, de Pinna & Baskin, 2005 ; and P. amphioxus , new species.