The Atlantic species of the exocoetid genus Cypselurus are reviewed and six species recognized: Cypselurus comatus, C. cyanopterus, C. exsiliens, C. furcatus, C. heterurus, and C. pinnatibarbatus. A diagnosis and synonymy is presented for the genus, as well as discussions
of ontogeny and range. The splitting of Cypselurus and recognition of the genus Cheilopogon by Parin (1961) is not accepted. Two keys to Atlantic species are presented; one for specimens under 100 mm standard length, the other for larger specimens. For each species distinctive
characters, description, and synonymy are given, and ontogeny, range and reproductive biology are discussed. Particular attention is paid to the ontogenic changes in pectoral and pelvic fin coloration with regard to identification. The placement of C. luetkeni in the synonymy of
C. heterurus and of C. lineatus in the synonymy of C. pinnatibarbatus is upheld.
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