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Neotropical Ichthyology, 3(4):549-569, 2005 Copyright 2005 Sociedade Brasileira de Ictiologia
 

Summary: 549
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Neotropical Ichthyology, 3(4):549-569, 2005
Copyright © 2005 Sociedade Brasileira de Ictiologia
The loricariid catfish genus Lasiancistrus (Siluriformes)
with descriptions of two new species
Jonathan W. Armbruster
Lasiancistrus (Loricariidae: Hypostominae: Ancistrini) is diagnosed by the unique presence of a ventral strut of the pterotic
and the presence of whiskerlike odontodes on the snout. Lasiancistrus has about 16 species assigned to it; however, only four
are valid (L. schomburgkii, L. caucanus, L. guacharote, and L. heteracanthus), L. nationi is an Ancistrus, and L. trinitatus is
incertae sedis in the Loricariidae. Lasiancistrus maracaiboensis and L. mystacinus are synonyms of L. guacharote; L. pictus,
L. castelnaui, L. caquetae, L. guapore, L. multispinis, and L. scolymus are synonyms of L. schomburgkii; and L. planiceps, L.
mayoloi, and L. volcanensis are synonyms of L. caucanus. Two new species are described: L. tentaculatus from the río
Orinoco basin and L. saetiger from the rio Guama. The species can largely be told apart via color (L. schomburgkii has no or
white spots on the fins, L. saetiger has entirely gray fins, and the rest have black spots in the fins), the presence of abdominal
plates (L. caucanus, L. saetiger, and L. tentaculatus have naked abdomens, L. guacharote has a few small plates near the
insertion of the pectoral fin, L. heteracanthus has a large patch of small plates, and L. schomburgkii is variable), and nuptial
male condition (L. tentaculatus has small tentacles along the edge of the snout and the other species have a patch of whisker-

  

Source: Armbruster, Jonathan W. - Department of Biological Sciences, Auburn University

 

Collections: Environmental Sciences and Ecology