Leptotaenia ischnorhyncha (Lühe, 1898) is redescribed on the basis of a specimen from Phoenicopterus ruber in Cuba. In contrast to previous descriptions, the presence of two rows of rostellar hooks, a secondary female copulatory organ and four types of cirrus spines are observed. Leptotaenia sp. from P. minor from Kenya, identified as L. ischnorhyncha and figured by Khalil (1994), is described on the basis of poorly preserved specimens. The synonymy of L. skrjabini Shakhtakhtinskaya, 1953 from P. ruber in Azerbaijan with L. ischnorhyncha, proposed by Ryzhikov & Tolkacheva (1981), is questioned and the former is regarded as a species inquirenda. The diagnosis of Leptotaenia Cohn, 1901 is amended.
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