The Platyproteum are a genus of parasitic alveolates in the phylum Apicomplexa. Species in this genus infect marine invertebrates. This genus was created in 2009 by Sonja Reuckert and Brian Leander. There is one species in this genus - Platyproteum vivax. This species was moved from the genus Selenidium. It appears to be related to Filipodium phascolosomae.