Species: fiji mermaid
The Fiji mermaid was composed of the torso and head of a juvenile monkey sewn to the back half of a fish, presented as the mummified body of a merfolk supposedly caught near the Fiji Islands in the South Pacific.
Several replicas and variations have been created and exhibited under similar names and pretexts. P. T. Barnum exhibited the original in Barnum's American Museum in New York in 1842, but it then disappeared - likely destroyed in one of the many fires that destroyed parts of Barnum's collections.