The common thresher (Alopias vulpinus) can harbor a number of internal and external parasites:
Type Species Protozoans Giardia intestinalis Monogeneans Cathariotrema selachii Flukes Campula oblonga (not usual host) Paronatrema vaginicola Tapeworms Acanthobothrium coronatum Anthobothrium laciniatum Crossobothrium angustum Floriceps uncinatus Hepatoxylon trichiuri Lacistorhynchus tenuis Marsupiobothrium alopias Molicola uncinatus Monorygma megacotyla Paraorygmatobothrium exiguum Paraorygmatobothrium filiforme Sphyriocephalus tergetinus Sphyriocephalus viridis Copepods Dinemoura discrepans Dinemoura producta Echthrogaleus denticulatus Gangliopus pyriformis Kroeyerina benzorum Nemesis aggregatus Nemesis lamna Nemesis robusta Nemesis tiburo Nesippus orientalis Pandarus smithii Pandarus cranchii
References Euzet, L. (1959). "Recherches sur les cestodes tétraphyllides des sélaciens des côtes de France." Thèse, Faculté des Sciences, Université de Montpellier, France.