Crinoids (Delocrinus, Endelocrinus, Grajjhamicrinus, Pa/merocrinus, Diphuicrinus; Delocrinus hemisphericus, and Delocrinus elongatus 11. sp.); Chesterian (Lower Carboniferous); Pennsylvanian (Morrowan, Atokan, Desmoinesian, Missourian. Virgilian), Upper Carboniferous; Nodaway Coal; Coal Creek Limestone; Fremont County. Iowa; Taylor County, Iowa; Washington and Osage Counties. Oklahoma; Lower Permian (Wolfcampian)
The purpose of the present study is to describe an historically important crown (cup with arms attached) of Delocrinus hemisphericus from Virgilian strata in Taylor County, Iowa, collected by C. A. White sometime during his tenure as State Geologist of Iowa (1866-1869) , and to clarify the present status of the genus Delocrinus. Several crowns of D. hemisphericus, one crown of Graffhamicrinus nodosarius (Strimple), and a divergent form described as Delocrinus elongatus n. sp. from the Virgilian of Oklahoma are illustrated. Possible phylogenies are discussed with emphasis on the genera Delocrinus. Graffhamicrinus. and Diphuicrinus.
Proceedings of the Iowa Academy of Science
© Copyright 1977 by the Iowa Academy of Science, Inc.
Strimple, H. L.
"Notes Concerning Delocrinus and Graffhamicrinus (Crinoidea: Inadunata),"
Proceedings of the Iowa Academy of Science: Vol. 84:
, Article 9.
Available at: http://scholarworks.uni.edu/pias/vol84/iss4/9