L172
01.06.2007, 20:26
Hallo!
Es gibt zwei neue Pseudancistrus aus Venezuela, made bei Armbruster und Co:
Two new species of Pseudancistrus from southern Venezuela (Siluriformes: Loricariidae)
Nathan K. Lujan*, Jonathan W. Armbruster* and Mark H. Sabaj**
Two new species of Pseudancistrus are described from the upper RÃ*o Orinoco and RÃ*o Negro in Southern Venezuela.
Pseudancistrus pectegenitor was collected in the main channel of the RÃ*o Orinoco near the mouth of the RÃ*o Ventuari and in the middle reaches of the RÃ*o 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 RÃ*o 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.
https://www.pfeil-verlag.de/04biol/d9902d18.php
Grüße,
Christian
Es gibt zwei neue Pseudancistrus aus Venezuela, made bei Armbruster und Co:
Two new species of Pseudancistrus from southern Venezuela (Siluriformes: Loricariidae)
Nathan K. Lujan*, Jonathan W. Armbruster* and Mark H. Sabaj**
Two new species of Pseudancistrus are described from the upper RÃ*o Orinoco and RÃ*o Negro in Southern Venezuela.
Pseudancistrus pectegenitor was collected in the main channel of the RÃ*o Orinoco near the mouth of the RÃ*o Ventuari and in the middle reaches of the RÃ*o 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 RÃ*o 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.
https://www.pfeil-verlag.de/04biol/d9902d18.php
Grüße,
Christian