The monophyly of the Capsalidae is supported by possession of accessory sclerites in the haptor (the posterior attachment organ), and was confirmed by molecular phylogeny. Their oncomiracidium (the free larva) is distinct from that of other families.
Genera as recognized in WorMs are listed below. Recent molecular analyses have shown that several genera, which were defined on morphological characters, are not monophyletic.
↑Bychowsky, B.E. (1957) Monogenetic Trematodes. Their systematic and phylogeny. Akad. Nauka. USSR. English translation by the American Institute of Biological Science, Washington. 509 pp.doi:10.5962/bhl.title.7475
↑Yamaguti, S. (1963) Systema Helminthum IV. Monogenea and Aspidocotylea. London-New York, Interscience Publishers. 699 pp.
12Perkins, Elizabeth M.; Donnellan, Steve C.; Bertozzi, Terry; Chisholm, Leslie A.; Whittington, Ian D. (2009). "Looks can deceive: Molecular phylogeny of a family of flatworm ectoparasites (Monogenea: Capsalidae) does not reflect current morphological classification". Molecular Phylogenetics and Evolution. 52 (3): 705–714. doi:10.1016/j.ympev.2009.05.008. ISSN1055-7903. PMID19457457.