Pleuromastigaceae is an obsolete family of

cryptomonads The cryptomonads (or cryptophytes) are a group of algae, most of which have plastids. They are common in freshwater, and also occur in marine and brackish habitats. Each cell is around 10–50 μm in size and flattened in shape, with an anterio ...

, which included genera '' Monomastix'', '' Pleuromastix'', and '' Xanthodiscus''. Today, Monomastix is regarded as a

green alga The green algae (singular: green alga) are a group consisting of the Prasinodermophyta and its unnamed sister which contains the Chlorophyta and Charophyta/Streptophyta. The land plants (Embryophytes) have emerged deep in the Charophyte alga as ...

, and since 1987 Xanthodiscus is regarded as a synonym of

Prorocentrum The Prorocentrales are a small order of dinoflagellates. They are distinguished by having their two flagella inserted apically, rather than ventrally as in other groups. One flagellum extends forward and the other circles its base, and there are ...

. Pleuromastix remains unclassified as a part of any larger taxon as of 2019.

References

{{Cryptista Cryptomonads