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New Crinoids from the Naco Formation (Middle Pennsylvanian) of Arizona and a Revision of the Family Cromyocrinidae

G. D. Webster
Journal of Paleontology
Vol. 55, No. 6 (Nov., 1981), pp. 1176-1199
Stable URL: http://www.jstor.org/stable/1304548
Page Count: 24
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
New Crinoids from the Naco Formation (Middle Pennsylvanian) of Arizona and a Revision of the Family Cromyocrinidae
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Abstract

Two crinoid faunas of Desmoinesian age, Middle Pennsylvanian, are recognized in the beta member of the Naco Formation of eastern Arizona. One fauna is dominated by a diversity of cromyocrinids and the second contains two cromyocrinids. New species described are: Aglaocrinus konecnyorum, A. nacoensis, Dicromyocrinus beusi, and D. carrizoensis. The families Cromyocrinidae and Ulocrinidae are reviewed and combined. Repeated development of an invaginated cup, biserial arms and ornamentation, reduction of anal plates, and increase in number of arms are noted within the Family Cromyocrinidae. Two new genera are erected, Aaglaocrinus and Mathericrinus, and 23 new combinations are proposed.

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