This mentioned taxonomy is an attempt to make an conclusive assignment from the different classifications of various scientists. Because the taxonomy may change due to the latest investigative methods and other findings, our map is a guide only.
J. J. Sepkoski, Jr., 2002 - A compendium of fossil marine animal genera - Bulletins of American Paleontology (363), 1-560 (serial monograph, English)
H. B. Fell, 1966 - Echinacea - Treatise on Invertebrate Paleontology,Part U Echinodermata 3. The Geological Society of America and The University of Kansas Press (2), U367-U440 (book/book chapter, English)