Lingulodinium polyedrum is a single-celled organism belonging to a group of algae called dinoflagellates. It is armored, meaning it has a hard outer coating. Lingulodinium polyedrum forms cysts, or resting stages, as part of its life cycle. Another notable feature of L. polyedrum is bioluminescence – a blue flashing light is visible at night when water with high concentrations of cells is disturbed. This species is widely distributed in temperate and subtropical waters of coastal areas.