Anthozoans are a class of cnidarians that include only polyp forms, such as in corals and anemones. Class Anthozoa are exclusively marine and may be either colonial or solitary.
Bayer, F. M., et al. 1956. Systematic Descriptions, in Moore, R. C., eds., Treatise on Invertebrate Paleontology, Part F, Coelenterata, Volume 1. The University of Kansas and Geological Society of America. F16-F20 pp.