First issued in release COL21.6.
Last used in release COL23
Published in
Stephenson, T. A. (1920). On the classification of Actiniaria. Part I. -- Forms with acontia and forms with a mesogloeal sphincter. Quarterly Journal of Microscopical Science, 64, 2, (256): 425–574. https://www.marinespecies.org/actiniaria/aphia.php?p=sourcedetails&id=303128