Echinoidea, Bothriocidaris maquoketensis, Maquoketa Group, Upper Ordovician, Iowa
A new species of echinoid , Bothriocidaris maquoketensis, has been discovered in the Cincinnatian (Upper Ordovician) Fort Atkinson Formation, Maquoketa Group, of northeastern Iowa. The new species is characterized by two widely spaced primary perforate tubercles on opposite sides of the peripodia and by numerous paired interambulacral plates. This occurrence extends the geographic and stratigraphic range of Bothriocidaris in North America.
Proceedings of the Iowa Academy of Science
©1977 Iowa Academy of Science, Inc.
Kolata, Dennis R.; Strimple, Harrell L.; and Levorson, Calvin O.
"A New Species of Bothriocidaris (Echinoidea) from the Cincinnatian Maquoketa Group of Iowa,"
Proceedings of the Iowa Academy of Science, 84(4), 146-149.
Available at: https://scholarworks.uni.edu/pias/vol84/iss4/7