Pyrocystis elegans is a spherical dinoflagellate species, typically measuring 10-20 micrometers in diameter. It exhibits bioluminescence, emitting light when disturbed. The organism has two flagella for movement, a central nucleus, and chloroplasts for photosynthesis. Pyrocystis elegans inhabits marine environments, particularly in tropical or subtropical regions, where its bioluminescence likely serves ecological roles such as defense or attraction.