Ancistrus maracasae[1] is a species of catfish in the family Loricariidae.

It is a freshwater fish native to the Caribbean, where it occurs in the basin of the Maracas River, which is a major tributary of the Caroni River in Trinidad and Tobago, indicating that it is endemic to the island of Trinidad.

The species reaches 8.3 cm (3.3 inches) SL.

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