Distinguished from Phymosoma by the very much greater number of elements forming aboral ambulacral plates (10-12 as opposed to 5-6), and by the sunken peristome and lack of phyllodes. Distinguished from Acanthechinus by having primary tubercles with decidedly incised areoles, often with radial ornamentation on those of the oral surface. It also has a proportionally larger apical disc.
Cotteau, G. & Gauthier, V. 1895. Mission scientifique en Perse par J. Morgan. 3. Etudes geologiques, partie 2. Paleontologie: premiere partie. Echinides fossiles. E. Leroux, Paris, 142 pp., 16 pls.
Smith, A. B. 1995. Late Campanian-Maastrichtian echinoids from the United Arab Emirates-Oman border region. Bulletin of the Natural History Museum, London (Geology) 51, 121-240.