Abstract
Reports on Mississippian rostroconchs from the Appalachian basin are rare. Winchell (1871), Herrick (1888, 1890, 1891), Hyde (1953), and Hoare (1990, 2004) discussed taxa from Ohio. These reports concerned pre-Chesterian occurrences with the exception of the Chesterian Bransonia hydei Hoare, 1990 and Oxyprora sp. Hoare (2004) from the Maxville Limestone. Specimens of the new taxon were reported by Busanus (1974) as Conocardium spp. from the Chesterian Reynolds Limestone in northern West Virginia. Numerous specimens have been collected by RLP from five exposures of the Bluefield Formation, Mauch Chunk Group (Chesterian), in Mercer County, West Virginia, Oakvale 7½′ quadrangle. Although many of the specimens are partially crushed or incomplete, several are well preserved and all retain the outer shell layer showing the ornamentation. Three internal molds are also present. The specimens represent a single species, Diedrorynchus dictyum new genus and species. The localities are given as Universal Transverse Mercator (UTM) designations which are used in geographic areas that were not surveyed into section, township, and range parcels. Four of the localities are exposures on the north side of U.S. Route 460, UTM 17507778E, 4133641N; UTM 17507588E, 4133551N; UTM 17507301E, 4133452N; UTM 17509153E, 4134253N. The fifth locality is in the Ada Shale Member, Bluefield …
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