The Echinoid Directory
Unibothriocidaris kieri Guensburg, 1984. Caradocian, Upper Ordovician, Tennessee, USA. External surface of three test fragments; note hexagonal imperforate column of plates in top left fragment; from Guensburg, T. E. 1984. Echinodermata from the Middle Ordovician Lebanon Limestone, Central Tennessee. Bulletins of American Paleontology, 86, 1-100.