Quadriacanthus Paperna, 1961 is revised and emended. Q. kobiensis Ha Ky, 1968 is redescribed from Clarias batrachus, and Q. bagrae Paperna, 1979 and Q. clariadis Paperna, 1961 are recorded from C. gariepinus, both from the River Gomti, Lucknow. India is a new geographical record for Q. bagrae and Q. clariadis. Anacornuatus Dubey et al., 1991 is considered a junior subjective synonym of Quadriacanthus Paperna, 1961. Quadriacanthus spp. are more specific to their hosts (micro-habitats) than geographical localizations (macro-habitats) suggesting geographical diversification of hosts plays a lesser role in monogenoidean speciation.
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