Priscosiren is an extinct genus of sirenian mammal which existed in the west Atlantic and Puerto Rico during the late Oligocene (Chattian).

[1] The type locality is the San Sebastián Limestone of Puerto Rico, with a record also known from the Chandler Bridge Formation of South Carolina, USA.

[2] Priscosiren was diagnosed from other "halitheriine" dugongids by Velez-Juarbe and Domning (2014).

[1] Priscosiren is recovered by Velez-Juarbe and Domning (2014) as sister to the Metaxytherium + Hydrodamalinae and Dugonginae clades.

This article about prehistoric Afrotheria is a stub.