Protocotyle is a genus of monogeneans in the family Hexabothriidae. The genus was created by Louis Euzet and Claude Maillard in 1974.
Protocotyle includes only three species, which are all parasitic on the gills of sharks of the genus Hexanchus, namely Hexanchus griseus and Hexanchus nakamurai. The species are: Protocotyle euzetmaillardi Justine, 2011 Protocotyle grisea (Cerfontaine, 1899) Euzet & Maillard, 1974 Cerfontaine, Paul. 1899: Contribution à l'étude des Octocotylidés. V. Les Onchocotylinae. Archives de Biologie, 16, 345-478 + Plates 18-21.Euzet, L. & Maillard, C. 1974: Les Monogènes Hexabothriidae Price, 1942. Historique, systématique, phylogenèse. Bulletin du Muséum National d'Histoire Naturelle, 3° série, 206, Zoologie 136, 113-141. Protocotyle taschenbergi (Maillard & Oliver, 1966) Euzet & Maillard, 1974 Maillard, C. & Oliver, G. 1966: Monogenea, Hexabothriidae. Vie et Milieu Série A: Biologie marine, 17, 1201-1216.
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