Based on light and scanning electron microscopic examination of their morphology, the dentition on both the premaxilla and dentary of Andersonia(Amphiliidae) and Siluranodon(Schilbeidae) catfishes is described from samples taken from tributaries of the White Nile in south‐western Ethiopia. These monotypic African genera were previously believed to lack teeth on the lower jaw in Andersonia and on both jaws in Siluranodon. Siluranodon exhibits an ontogenetic reduction: teeth were less frequently found in larger individuals than in smaller ones. In contrast to the adults of all other schilbeids, whose oral teeth are arranged in multiserial (or at least, biserial) bands, Siluranodon has uniserial teeth on both the premaxilla and the dentary. The adaptive, ontogenetic and phylogenetic aspects of jaw‐tooth reduction in catfishes are discussed.
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reduction of dentition
Document Type: Regular Paper
A. N. Severtsov Institute of Ecology and Evolution, Leninskii Prospekt 33, 119 071 Moscow, Russia and
Department of Lands and Natural Resources, Division of Fish and Wildlife, PMB 2761, P. O. Box 10 002, Saipan, MP 96 950, U.S.A.
Publication date: 01 January 2004