This study describes a new genus of melocrinitid crinoid from the Middle Devonian, Givetian Stage, of Iowa (subclass Camerata, family Melocrinitidae). The specimen described is assigned to Ronsocrinus gen. nov. within the family Melocrinitidae. Ronsocrinus rabia gen. et sp. nov. possesses a long heteromorphic column, small calyx plates with raised stellate patterns and a well-developed, long anal tube. Species within the family Melocrinitidae do not commonly possess a long anal tube or a spherical cup shape and the family diagnosis is expanded to include species with these characteristics.
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Vol. 21 • No. 1