Abstract
Two strophomenid brachiopod shell pavements bearing abundant edrioasteroid epizoans occur stratigraphically within the top 4.5 m of the Corryville Formation (Upper Ordovician, Maysvillian) in Boone County, Kentucky, and Hamilton County, Ohio. Both assemblages are dominated by Isorophus cincinnatiensis and contain Carneyella pilea and Streptaster vorticellatus as lesser constituents. Pedicle exterior valves of Rafinesquina “alternata”; are the preferred substratum for all species at both sites, but the Kentucky population occurs mainly on unabraded, articulated shells and the Ohio population occupies abraded, disarticulated shells. The Kentucky population includes a greater size range of Isorophus (at least three cohorts) than the Ohio population (at least two cohorts), suggesting a greater time span of colonization for the Kentucky site. Host shells from Kentucky have anterior‐posterior axes strongly aligned NE‐SW whereas the Ohio shells are unoriented. Isorophus in Kentucky show a preference for the ante...
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