Figure 2
From: Brittle-star mass occurrence on a Late Cretaceous methane seep from South Dakota, USA
New ophiuroid Brezinacantha tolis gen. et sp. nov. from Upper Cretaceous (Didymoceras cheyennense Zone, upper Campanian) methane seep deposits of Pennington County, South Dakota. (a) AMNH 113563 (holotype), articulated skeleton exposing ventral side. (b) Detail of (a) showing mouth plating. (c) MnhnL OPH039 (paratype), articulated skeleton showing ventral side. (d) AMNH 113564 (paratype), detail of an articulated skeleton fragment exposing the dorsal side shown in (e), with dorso-lateral view of three dental plates with teeth. (e) AMNH 113564 (paratype), articulated skeleton fragment exposing the dorsal side. (f) interpretative drawing of the articulated skeleton fragment shown in (f). Abbreviations: AOS: adoral shield; APa: apical oral papilla; AS: arm spine; DAP: dorsal arm plate; DP: dental plate; IS: interradial disc scales; LAP: lateral arm plate; LPa: lateral oral papilla; OP: oral plate; OS: oral shield; RS: radial shield; T: tooth; 1VAP: first ventral arm plate. Scale bars equal 1 mm.
