Fig. 7

Amphiura shannoni sp. nov. from the Peedee Formation (upper Maastrichtian, Upper Cretaceous) at the road ramp construction site in North Myrtle Beach (Horry County, South Carolina), a MnhnL OPH068 (holotype), dissociated proximal lateral arm plate in external (1) and internal (2) views, and with detail of spine articulations in distal (3) view; b NHMM 2018 024 (paratype), dissociated proximal lateral arm plate in external (1) and internal (2) views; c MnhnL OPH069 (paratype), dissociated distal lateral arm plate in external (1) and internal (2) views. Amphioplus clementsi sp. nov. from the Peedee Formation (upper Maastrichtian, Upper Cretaceous) at the road ramp construction site in North Myrtle Beach (Horry County, South Carolina), d MnhnL OPH068 (holotype), dissociated proximal lateral arm plate in external (1) and internal (2) views, view; e NHMM 2018 025 (paratype), dissociated proximal lateral arm plate in external (1) and internal (2) views, and with detail of spine articulations in distal (3); f MnhnL OPH069 (paratype), dissociated distal lateral arm plate in external (1) and internal (2) views. Abbreviations: di: distal; do: dorsal; F: furrow; pr: proximal. Scale bars equal 0.2 mm