An emended diagnosis of ThaumatocotyleScott, 1904 (Monogenoidea: Monocotylidae) and a list of its species are provided. Merizocotyle urolophiChisholm and Whittington, 1999, Merizocotyle macrostrobusChisholm and Whittington, 2012, Merizocotyle papillaeChisholm and Whittington, 2012, and Merizocotyle rhadinopeosChisholm and Whittington, 2012 are transferred to Thaumatocotyle as new combinations. Thaumatocotyle pseudodasybatisHargis, 1955 is redescribed and is currently restricted to Thaumatocotyle-like helminths parasitizing the olfactory organs of the white-spotted eagle ray Aetobatus narinari (Euphrasen, 1790) (Myliobatiformes: Aetobatidae) in the western Atlantic Ocean. Two new species are described that infect the olfactory organs of pelagic eagle rays: Thaumatocotyle adelpha n. sp. from the ocellated eagle ray Aetobatus ocellatus (Kuhl, 1823) in the central and western Pacific Ocean and Thaumatocotyle casigneta n. sp. from the Pacific eagle ray Aetobatus laticeps Gill, 1865 from the eastern Pacific Ocean off the western coast of Mexico. Based on comparative morphology, T. pseudodasybatis, T. adelpha, and T. casigneta appear to form a subgroup of species that developed secondarily within the genus.

提供了对Thaumatocotyle Scott, 1904 (Monogenoidea: Monocotylidae)的修正诊断及其物种列表。Merizocotyle urolophi Chisholm and Whittington, 1999, Merizocotyle macrostrobus Chisholm and Whittington, 2012, Merizocotyle papillae Chisholm and Whittington, 2012, 和Merizocotyle rhadinopeos Chisholm and Whittington, 2012作为新组合转移到Thaumatocotyle。Thaumatocotyle pseudodasybatis Hargis, 1955 被重新描述，目前仅限于寄生在白斑鹰鳐Aetobatus narinari的嗅觉器官的类似Thaumatocotyle的蠕虫(Euphrase, 1790) (Myliobatiformes: Aetobatidae) 在西大西洋。描述了两个感染远洋鹰鳐的嗅觉器官的新物种：Thaumatocotyle adelpha n。sp。来自太平洋中部和西部的单眼鹰鳐Aetobatus ocellatus (Kuhl, 1823) 和Thaumatocotyle casigneta n。sp。来自太平洋鹰鳐Aetobatus laticeps Gill，1865 年来自墨西哥西海岸的东太平洋。基于比较形态学，T. pseudodasybatis、T. adelpha和T. casigneta似乎形成了在该属内次生的物种亚群。