1) Genus peridinium 2) Protoctist genus 
Peridinium is a genus of motile, marine and freshwater dinoflagellates. Their morphology is considered typical of the armoured dinoflagellates, and their form is commonly used in diagrams of a dinoflagellate`s structure. Peridinium can range from 30-70 μm in diameter, and has very thick thecal plates. == Species == Some species are: ...
(from the article `algae`) ...in humans when ingested; more than 1,200 species described, most in the class Dinophyceae; Alexandrium, Dinophysis, Gonyaulax, Peridinium, and ...
[n] - type genus of the family Peridiniidae
genus Peridinium noun type genus of the family Peridiniidae