Journal Article
A new species od sand-dwelling catfish, with a phylogenetic diagnosis of Pygidianops Myers (Siluriformes: Trichomycteridae: Glanapteryginae)
de Pinna, M.C.C. and Kirovsky, A.L.
Record Number:
3154
Year:
2011
Journal:
Neotropical Ichthyology
Pages:
493-504
Volume:
9
Abstract:
A new species of sand-dwelling catfish genus Pygidianops, P. amphioxus, is described from the Negro and lower Amazon
basins. The new species differs from its three congeners in the elongate eel-like body, the short barbels, and the small caudal
fin, continuous with the body, among other traits of internal anatomy. The absence of anal fin further distinguishes P.
amphioxus from all other Pygidianops species except P. magoi and the presence of eyes from all except P. cuao. The new
Pygidianops seems to be the sister species to P. magoi, the two species sharing a unique mesethmoid with a dorsally-bent tip
lacking cornua, and a produced articular process in the palatine for the articulation with the neurocranium. Pygidianops
amphioxus is a permanent and highly-specialized inhabitant of psammic environments. Additional characters are proposed as
synapomorphies of Pygidianops, including a hypertrophied symphyseal joint and associated ligament in the lower jaw; an
elongate, laterally-directed, process on the dorsal surface of the premaxilla; and a rotated lower jaw, where the surface normally
facing laterally in other glanapterygines is instead directed ventrally. These and other characters are incorporated into a
revised phylogenetic diagnosis of Pygidianops.
Times Cited:
3
Relevent Species:
Related Records:
Myers, G. S. (1944)
Two extraordinary new blind nematognath fishes from the Rio Negro, representing a new subfamily of Pygidiidae, with a rearrangement of the genera of the family
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de Pinna, M.C.C. and Kirovsky, A.L. (2011)A new species od sand-dwelling catfish, with a phylogenetic diagnosis of Pygidianops Myers (Siluriformes: Trichomycteridae: Glanapteryginae)
de Pinna, M.C.C. and Kirovsky, A.L. (2011)A new species od sand-dwelling catfish, with a phylogenetic diagnosis of Pygidianops Myers (Siluriformes: Trichomycteridae: Glanapteryginae)
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