The Family Peridiniidae consists of many organisms that are commonly known as dinoflagellates. These unicellular organisms are mostly marine and are considered an important part of the food chain. There are various synonyms for the word "Family Peridiniidae," including "Peridinidae," "Glenodiniidae," and "Protoperidiniaceae." These synonyms are often used interchangeably to refer to members of the same family of dinoflagellates. Despite the numerous synonyms used to describe the members of this family, they all have one thing in common: they are all photosynthetic, and many of them are often involved in producing harmful algal blooms that have a significant impact on the marine ecosystem.