| name = Centrohelids | image = Raphidiophrys contractilis.jpg | image_width = 220px | image_caption = Raphidiophrys contractilis | domain = Eukaryota | ordo = Centrohelida | ordo_authority = Kühn 1926 | subdivision_ranks = Families | subdivision = Raphidiophryidae Acanthocystidae Heterophryidae }} The centrohelids or centroheliozoa are a large group of heliozoan protists. They include both mobile and sessile forms, found in freshwater and marine environments, especially at some depth. I… (More on Centrohelid)