Abstract
C. obvelatus (Creplin, 1825) Seurat, 1919 is redescribed on the basis of specimens from the esophagus of L. delawarensis Ord from Lake Ontario [Canada]. The specimens were compared with Creplin''s (1825) types of C. obvelatus and the following synonyms of C. obvelatus are recognized: C. diesingi Molin, 1858; Spiroptera adunca Stossich, 1892 (not Creplin, 1846); C. aduncus Yorke and Maplestone, 1926 (not Creplin, 1846); C. faridi Khalil, 1931; C. firlottei Rao, 1951; C. tanakai Rodrigues and Vicente, 1963. Creplin''s types of C. adunca (Creplin, 1846) Yorke and Maplestone, 1926 were examined and shown to belong to the genus Paracuaria resulting in the new combination P. adunca (Creplin, 1846). C. asturis Yorke and Maplestone, 1926 is transferred to the genus Synhimantus, i.e, S. asturis (Yorke and Maplestone, 1926) comb. nov. Besides C. obvelatus, the genus Cosmocephalus apparently contains only C. capellae Yamaguti, 1935, C. imperialis Morishita, 1930 and C. jaenschi Johnston and Mawson, 1941.

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