... assemblages, and the morphological similarity between certain rhombiferan taxa and coeval infested crinoids. The common hemicosmitid rhombiferan Caryocrinites Say, 1825 is widespread throughout the middle Silurian of eastern North America and is herein reported to contain symbiotic (potentially parasitic...

...Figure 4 — Caryocrinites ornatus c axes as oriented in an individual element reference frame. Each plate is standardized to be coplanar with the plane of the stereogram, with the exterior surface facing the upper hemisphere and the adoral portion of the plate directed toward the top of the page...

...Figure 6. Oral areas of the Caryocrinitidae. (A) Caryocrinites sensu stricto (= C. ornatus Say, 1825 , type species of Caryocrinites , redrawn after Frest, 1975 , fig. 3a). (B) Paracaryocrinites Chen & Yao, 1993 (= an unnamed species, after Jaekel, 1899 , pl. 18, fig. 4). (C...

...Figure 9. Caryocrinites and a diplobathrid camerate from the Pepcon Cement Quarry: ( 1, 4 ) Internal molds of Diplobathrida indet.: ( 1 ) OSU 558819, lateral view of internal mold, note mold of pluricolumnal along the upper right margin of the calyx; ( 4 ) OSU 558820, calyx with column attached...

... ambulacral cover plates fixed; but in some instances, the abaxial ambulacral cover plates remain moveable. Additionally, some lineages that possessed a tegmen evolved an oral surface secondarily, likely as an atavism. Based on this restricted definition of a tegmen, the hemicosmitid blastozoan Caryocrinites...

... along depositional strike. occur in some horizons. Nearly all specimens of the cystoid Caryocrinites and the flexible crinoid Asaphocrinus col- Ichnofauna lected from the Homocrinus intervals possess both columns and complete crowns (Figs. 4C, 9B, 10). Yet, in other The Homocrinus intervals...

... by Bowman and assigned Ordovician to Silurian age to this limestone. Hagen (1959) supported Auden's stratigraphic conclusions on the basis of some Ordovician and Silurian trilobites which he found in these rocks. Stocklin et al., (1977) described thecal plates of cystoid Caryocrinites from the limestone...

... overgrown by attachment structure of Caryocrinites (Rhombifera). Note that these Caryocrinites attachment structures are more conical and morphologically simple than the branching dendritic radices common to this genus, and that diploporite attachments...