Chasmocranus is a genus of catfishes (order Siluriformes) of the family Heptapteridae. It includes the following species:
- C. brachynemus Gomes & Schubart, 1958
- C. brevior Eigenmann, 1912
- C. chimantanus Inger, 1956
- C. longior Eigenmann, 1912
- C. lopezi Miranda Ribeiro, 1968
- C. peruanus Eigenmann & Pearson, 1942
- C. quadrizonatus Pearson, 1937
- C. rosae Eigenmann, 1919
- C. surinamensis (Bleeker, 1862)
- C. truncatorostris Borodin, 1927
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