The Echinoid Directory
Polytaxicidaris dyeri Kier, 1958; Museum of Comparative Zoology, Harvard 3353 (paratype). Borden Group, Osagean, Lower Carboniferous, Crawfordsville, Indiana, USA. Mould of ?aboral surface, from Kier, P. M. 1958. New American Paleozoic echinoids. Smithsonian Miscellaneous Collections 135(9), 26 pp. 8 pls.
Diameter of test ca. 24 mm.