The Echinoid Directory

Polytaxicidaris dyeri Kier, 1958; Museum of Comparative Zoology, Harvard 102078 (holotype). Borden Group, Osagean, Lower Carboniferous, Crawfordsville, Indiana, USA. Mould of aboral surface of holotype, from Kier, P. M. 1958. New American Paleozoic echinoids. Smithsonian Miscellaneous Collections 135(9), 26 pp. 8 pls.

Diameter of test 32 mm.