Cosmocampus brachycephalus (American crested pipefish) is a species of marine fish of the family Syngnathidae. It is found in the western Atlantic Ocean, near southern Florida (USA), the Bahamas, and northern South America. It lives in sub-tidal grass flats to depths of 10 metres (33 ft), where it can grow to lengths of 10 centimetres (3.9 in). This species ovoviviparous, with males carrying eggs and giving birth to live young.

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