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Early Silurian Camerate Crinoids of Eastern Iowa

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Early Silurian Camerate Crinoids of Eastern Iowa Proceedings of the Iowa Academy of Science Volume 88 Number Article 3 1981 Early Silurian Camerate Crinoids of Eastern Iowa Brain J. Witzke University of Iowa Harrell L. Strimple University of Iowa Let us know how access to this document benefits ouy Copyright ©1981 Iowa Academy of Science, Inc. Follow this and additional works at: https://scholarworks.uni.edu/pias Recommended Citation Witzke, Brain J. and Strimple, Harrell L. (1981) "Early Silurian Camerate Crinoids of Eastern Iowa," Proceedings of the Iowa Academy of Science, 88(3), 101-137. Available at: https://scholarworks.uni.edu/pias/vol88/iss3/3 This Research is brought to you for free and open access by the Iowa Academy of Science at UNI ScholarWorks. It has been accepted for inclusion in Proceedings of the Iowa Academy of Science by an authorized editor of UNI ScholarWorks. For more information, please contact [email protected]. Witzke and Strimple: Early Silurian Camerate Crinoids of Eastern Iowa Proc. Iowa Acad. Sci. 88 (3): 101-137. 1981 Early Silurian Camerate Crinoids of Eastern Iowa BRIAN J. WITZKE and HARRELL L. STRIMPLE Iowa Geological Survey and Department of Geology, The University of Iowa, Iowa City 52242 Large and diverse Lower Silurian (late Llandoverian) camerate crinoid faunas from the Hopkinton Dolomite of eastern Iowa form the basis of the present study and partially fill the long gap between previously known Late Ordovician and Middle Silurian (Wenlockian) faunas. Taxa are considered in detail up to and including superfamilial level. Several superfamilies and 12 families are recognized covering 20 genera, of which 8 are new. Three subgenera are recognized, one of which ( Eucrinus) was originally described as a discrete genus. Thirty-eight species are recognized, 17 of which are described as new taxa, but 15 are relegated to an informal (unnamed) status due to preservational difficulties. New genera are Luxocrinus, Allozygocrinus, Pregaza­ crinus, Bolicrinus, Thomasocrinus, Krinocrinus, Archaeocalyptocrinus, and Theleproktocrinus. New species are Luxocrinus simplex, Dimerocrinites(Dimerocrinites) scufPtus, D. (D.) hopkintonensis, Allozygocrinus dubuquensis, Pregazacrinus hemisphericus, Carpocrinus bodei, Bolicrinus globosus, B. deflatus, Thomasocrinus cylindrica, Krinocrinus inflatus, Macrostylocrinus compressus, M. vermiculatus, Allocrinus ornatus, Marsupiocrinus (Amarsupiocrinus) primaevus, Archaeocalyptocrinus nodosus, A. iowensus, and Theleproktocrinus davidsoni. Stratigraphy of the Hopkinton Dolomite has been summarized elsewhere and is not extensively discussed. New information on the phylogeny of the Silurian camerate crinoids, as interpreted from the Hopkinton collections, has modified and expanded the understanding of an Early Silurian evolutionary radiation. INDEX DESCRIPTORS: Paleontology, Silurian, Llandoverian, Hopkinton Dolomite; eastern Iowa; Crinoidea, Camerata; new genera Luxocrinus, Allozygocrinus, Pregazacrinus, Bolicrinus, Thomasocrinus, Krinocrinus, Archaeocalyptocrinus, and Theleproktocrinus; new speciesLuxocrinus simplex, Dimerocrinites ( Dimerocrinites) sculptus, D. (D .) hopkintonensis, Allozygocrinus dubuquensis, Pregazacrinus hemisphericus, Carpocrinus bodei, Bolicrinus globosus, B. deflatus, Thomasocrinus cylindrica, Krinocrinus i'lflatus, Macrostylocrinus compressus, M. vermiculatus, Allocrinus ornatus, Marsupiocrinus (Amarsupiocrinus) primaevus, Archaeocalyptocrinus nodosus, A. iowensis, and Theleproktocrinus davidsoni. INTRODUCTION ................................................................................................. 103 EVOLUTION OF THE SILURIAN CAMERATE CRINOIDS ............................................................. 103 ACKNOWLEDGEMENTS ......................................................................................... 105 TERMINOLOGY ................................................................................................. 105 REPOSITORIES .................................................................................................. 105 SYSTEMATIC PALEONTOLOGY .................................................................................. 105 Class CRINOIDEA Miller, 1821 ................................................................................... 105 Subclass CAMERATA Wachsmuth & Springer, 1885 ............................................................... 105 Order DIPLOBATHRIDA Moore & Laudon, 1943 ................................................................ 105 Suborder EUDIPLOBATHRINA Ubaghs, 1953 ................................................................. 105 Superfamily RHODOCRINITACEA Roemer, 1855 .............................................................. 105 Family RHODOCRINITIDAE Bassler, 1938 ................................................................. 106 Rhodocrinitid sp. .................................................................................... 106 Genus LUXOCRINUS n. gen. ......................................................................... 106 L. simplex n. sp ..................................................................................... 106 Superfamily DIMEROCRINITACEA Zittel, 1879 ............................................................... 107 Family DIMEROCRINffiDAE Bassler, 1938 ................................................................ 107 Genus DIMEROCRINITES Phillips, 1839 ................................................................. 108 Subgenus DIMEROCRINITES (DIMEROCRINITES) Phillips, 1839 ......................................... 108 D. (D.) sculptus n. sp .............................................................................. 108 D. (D.) hopkintonensis n. sp ........................................................................ 110 Subgenus DIMEROCRINITES (EUCRINUS) Angelin, 1878 ................................................ 110 D. (E.) sp ......................................................................................... 111 Family DIMEROCRINITIDAE? ................ I ..••••••••••••••••••••••••••••.•••••••••••••••••••••••••• 111 Genus ALLOZYGOCRINUS n. gen. .................................................................... 111 A. dubuquensis n. sp ................................................................................. 111 Family LAMPTEROCRINIDAE Bather, 1899 ................................................................ 112 Genus SIPHONOCRINUS S.A. Miller, 1888 .............................................................. 112 S. nobilis (Hall, 1861) ............................................................................... 112 Genus LAMPTEROCRINUS Roemer, 1860 ............................................................... 112 L. sp .............................................................................................. 113 Family GAZACRINIDAE S. A. Miller, 1892 ................................................................ 113 Genus PREGAZACRINUS n. gen ........................................................................ 113 P. hemisphericus n. sp ............................................................................... 113 Published by UNI ScholarWorks, 1981 1 Proceedings of the Iowa Academy of Science, Vol. 88 [1981], No. 3, Art. 3 102 PROC. IOWA ACAD. SCI. 88 (1981) Order MONOBATHRIDA Moore & Laudon, 1943 ................................................................ 114 Suborder T ANAOCRININA Moore, 1952 ..................................................................... 114 Superfamily PERIECHOCRINACEA Bronn, 1849 .............................................................. 114 Family PERIECHOCRINIDAE Bronn, 1849 ................................................................. 114 Genus PERIECHOCRINUS Morris, 1843 ................................................................. 114 P. sp. A ........................................................................................... 114 P. sp. B ...........................................................................................116 Superfamily CARPOCRINACEA de Koninck & LeHon, 1854 .................................................... 116 Family CARPOCRINIDAE de Koninck & LeHon, 1854 ....................................................... 116 Genus CARPOCRINUS Muller, 1840 .................................................................... 116 C. bodei n. sp ...................................................................................... 116 C. sp ............................................................................................. .117 Suborder GLYPTOCRININA Moore, 1952 ........................... : . ....................................... 117 Superfamily PATELUOCRINACEA Angelin, 1878 ............................................................. 117 Family PATELUOCRINIDAE Angelin, 1878 ................................................................ 117 Genus BOUCRINUS n. gen ............................................................................ 117 B. globosus n. sp .................................................................................... 118 B. deflatus n. sp.................................................................................... 119 Genus THOMASOCRINUS n. gen ....................................................................... 119 T. cylindrica n. sp .................................................................................. .119 Genus KRINOCRINUS n. gen ........................................................................... 119 K. injlatus n. sp ....................................................................................
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