FIGURE 5 in A new phosphatized ophiuroid from the lower Triassic of Nevada and its position in the evolutionary history of the Ophiuroidea (Echinodermata)

FIGURE 5: Dissociated disc plates of the ophiuroid Ophiosuperstes praeparvus gen. et sp. nov., from the Virgin Limestone Member of the Moenkopi Formation, Spathian, lower Triassic, Lost Cabin Springs locality, southern Nevada. A: paratype (OPH188), oral plate in abradial view. B: paratype (OPH189), radial shield in external view, with outline of missing proximal tip reconstructed using a dashed grey line. C: paratype (OPH190) adradial genital plate in dorsal view. Abbreviations: AMF: abradial muscle fossa; do: dorsal; LG: longitudinal groove; pr: proximal. All scale bars equal 0.2 mm.