Fig. 4 in First Jurassic brittlestar from Neuquén Basin, Argentina

Fig. 4. Ophioleucid ophiuroid Sinosura sp. (MOZ-PI-5930) from the lower Pliensbachian of Sierra Chacaicó Formation, Arroyo Lapa locality, Neuquén, Argentina. A. General view of the studied specimen. B. Diagram of ophiuroid burial position, note that the unpaired arm is oriented in the opposite direction of the other four arms. C. Detail of the central disc. D. Close view of the unpaired arm, arrows showing pyrite framboids. E. Close view of a paired arm, arrows showing limonite covering striated lateral ossicles. F. Unpaired arm close view, arrows showing spines. G. SEM caption of arm lateral ossicle, stereom structure is obscured by the presence of pyrite framboid aggregation. H. Radiolarian test preserved near the ophiuroid arm.