The economically important African catfish genus Heterobranchus has been revised using biometrical and osteological features. From the 11 nominal species assigned to this genus, four are recognized as valid: H. bidorsalis. H. isopterus, H. longifilis and H. boulengeri. A key to the species together with species descriptions and data on the distribution of each species are given, as is a discussion of their phylogeny.
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Teugels et al. (1990) studied this question.
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