Pseudancistrus corantijniensis, a new species from the Guyana Shield (Siluriformes: Loricariidae) with a molecular and morphological description of the Pseudancistrus barbatus group
SOPHIE DE CHAMBRIER & JUAN I. MONTOYA-BURGOS
Department of Zoology and Animal Biology, University of Geneva, 30 quai Ernest Ansermet, 1211 Genve 4, Switzerland.
E-mail: Juan.Montoya@unige.ch
Abstract
Pseudancistrus corantijniensis is described based on specimens captured in the Corantijn River in Suriname. It is diagnosed by a particular arrangement of whitish spots, very small in the anterior three quarters of the head and large from the posterior part of the head to the caudal peduncle. As indicated by our molecular phylogeny based on mitochondrial D-loop sequences, P. corantijniensis is a member of the Pseudancistrus barbatus group comprising Guyanese derived Pseudancistrus bearing hypertrophied odontodes along the snout and nonevertible cheek plates. Other members of this group are P. barbatus, P. depressus and P. nigrescens. The closest relative to the new species is P. nigrescens, while P. barbatus and P. depressus are sister species. The known distribution range of each of the four members of the P. barbatus group is disjoint. A key is provided for the identification of the four members of the P. barbatus group.
Key words:
Armored catfish, Guyanas region, Suriname, endemic, D-loop phylogeny, Corantijn
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