Figure 3. New ophiuroid <i>Brezinacantha tolis</i> gen. et sp. nov. from Upper Cretaceous (Didymoceras cheyennense Zone, upper Campanian) methane seep deposits of Pennington County, South Dakota. (a) MnhnL OPH040 (paratype), dissociated proximal lateral arm plate in external view, with dorsal side pointing upwards. (b) AMNH 113565 (paratype), median arm segments in lateral view, with dorsal side pointing downwards. (c) detail of (a) showing spine articulation. (d) AMNH 113566 (paratype), dissociated oral plate in adradial view. (e) AMNH 113567 (paratype), dissociated proximal vertebra in distal view, with dorsal side pointing upwards. (f) AMNH 113568 (paratype), dissociated arm spines, with proximal tip pointing downwards. Abbreviations: MO: muscle opening; NO: nerve opening. Scale bars equal 0.5 mm in (a,b) and (d–f), and 0.1 mm in (c).
Thuy, B., Landman, N,H., Larson, N.L., Numberger-Thuy, L.D. 2018. Brittle-star mass occurrence on a Late Cretaceous methane seep from South Dakota, USA. <i>Scientific Reports</i> 8: 9617.
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