Pseudancistrus yekuana
Lujan, Armbruster & Sabaj, 2007
Lujan, N.K., Armbruster, J.W. & Sabaj, M.H.Two new species of Pseudancistrus are described from the upper Rio Orinoco and Rio Negro in Southern Venezuela. Pseudancistrus pectegenitor was collected in the main channel of the Rio Orinoco near the mouth of the Rio Ventuari and in the middle reaches of the Rio Casiquiare. It differs from congeners by having 10-11 dorsal-fin rays (vs. seven), adpressed cheek odontodes reaching to three or more plates beyond the opercle in adults (vs. maximally to rear edge of the opercle), plates of ventral row of caudal peduncle with dorsal laminae strongly concave, accentuating the medial keel of the ventral plate row (shared with P. sidereus), and large oral papillae internal to the dentary tooth cup (shared with P. coquenani, P. orinoco, and P. yekuana). Pseudancistrus yekuana is known only from the type locality, immediately upstream of Salto Tencua in the upper Rio Ventuari. It differs from congeners by having large oral papillae internal to the dentary tooth cup (shared with P. coquenani, P. orinoco, and P. pectegenitor), lower lip reaching to middle of pectoral girdle (vs. to anterior edge of pectoral girdle), pectoral-fin spine maximally reaching posterior base of the pelvic-fin spine when adpressed ventral to the pelvic fin (vs. at least halfway through pelvic-fin insertion) and by several morphometric differences.
Two new species of Pseudancistrus from southern Venezuela.
Ichthyological Exploration of Freshwaters, 18 (2): 163–174.