Sygcaulocrinus, Bottom Dweller, Ordovician, Winneshiek County
Attention is called to the synonomy of Ectenocrinus elongatus Thomas and Ladd, 1926, with Sygcaulocrinus typus Ulrich, 1924, both from the Ft. Atkinson Member, Maquoketa Formation (Ordovician), and to the probable bottom dwelling habitat of the species. Comparison is made with some Upper Paleozoic crinoids which are known to have been bottom dwellers. An accident in preparation of a specimen disclosed the solid base of the cup and the solid summit of the proximal columnal, both of which are illustrated.
Proceedings of the Iowa Academy of Science
©1974 Iowa Academy of Science, Inc.
Strimple, Harrell L.
"The Crinoid Genus Sygcaulocrinus from Iowa,"
Proceedings of the Iowa Academy of Science, 81(3), 116-118.
Available at: https://scholarworks.uni.edu/pias/vol81/iss3/9