Priscosiren is an extinct genus of sirenian mammal which existed in the west Atlantic and Puerto Rico during the late Oligocene (Chattian).Jorge Vélez-Juarbe & Daryl P. Domning (2014) Fossil Sirenia of the West Atlantic and Caribbean region: X. Priscosiren atlantica, gen. et sp. nov., Journal of Vertebrate Paleontology, 34:4, 951-964, DOI: 10.1080/02724634.2013.815192
Distribution 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.
Description Priscosiren was diagnosed from other "halitheriine" dugongids by Velez-Juarbe and Domning (2014).
Phylogeny Priscosiren is recovered by Velez-Juarbe and Domning (2014) as sister to the Metaxytherium + Hydrodamalinae and Dugonginae clades.
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