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Dactylidia mutica (Say, 1822)
Subfamily: OlivellinaeGenus: Dactylidia
Distribution: Temperate Northern Atlantic realm. Warm Temperate Northwest Atlantic province (East coast of the USA from the Maryland-Virginia border southward to Florida as well as along the northern Gulf of Mexico coastline to the panhandle counties of Florida). Pliocene. Pliocene of Maryland, Virginia, North Carolina and South Carolina (Yorktown Formation). Pleistocene. Pleistocene of Florida, USA (Fort Thompson Formation). Pleistocene of South Carolina, USA.
The species was documented in detail by Krisberg (2017). It most closely resembles the congeneric and partialy syntopic Dactylidia pusilla (Marrat, 1871) but differs by growing larger (maximum shell length up to c 12 mm), having a less elongate shell, less callused shoulder and a smaller protocnch.