Systematics of Lamontichthys Miranda-Ribeiro (Siluriformes: Loricariidae),
with the description of two new species
Andrea de Carvalho Paixão and Mônica Toledo-Piza
Abstract:
The taxonomic revision of the genus Lamontichthys Miranda-Ribeiro, based on the examination of 164 specimens of different
river drainages throughout the Amazon basin, revealed the presence of six species of which two are new. Lamontichthys
filamentosus occurs in the upper and middle portions of the rio Amazonas basin; L. llanero in the río Orinoco basin; L.
maracaibero in the lago Maracaibo basin; and L. stibaros in the upper río Amazonas basin. Lamontichthys avacanoeiro, new
species, occurs in the upper rio Tocantins basin; and L. parakana, new species, in the lower rio Tocantins basin. The new
species represent a considerable extension in the so far known distribution of the genus. A parsimony analysis, including 87
osteological and external morphological characters from Lamontichthys and related taxa (total of 16), resulted in three most
parsimonious trees with 194 steps (CI = 0.73 and RI = 0.78). The hypothesis of monophyly of Lamontichthys is corroborated
and supported by six derived characters. Within Lamontichthys two monophyletic assemblages are recognized, one includes
L. avacanoeiro and L. stibaros, the other includes L. maracaibero and the clade formed by L. filamentosus and L. llanero. The
relationships of Lamontichthys parakana, a species that was not included in the phylogenetic analysis is discussed. The
monophyly and relationships of the monotypic genus Pterosturisoma microps are also discussed.
Neotropical Ichthyology, 7(4):519-568, 2009
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