Fig. 5 in First Jurassic brittlestar from Neuquén Basin, Argentina

Fig. 5. Ophioleucid ophiuroid Sinosura sp. (MOZ-PI-5930) from the lower Pliensbachian of Sierra Chacaicó Formation, Arroyo Lapa locality, Neuquén, Argentina. A. Mouth skeleton of the studied specimen in ventral view, showing the vertebrae (V) of two arms, one oral shield (OS) proximally bordered by the adoral shields (AOS), a pair of oral plates (OP) and a ventralmost tooth (T). B. Detail of the lateral arm plates (LAP) showing the vertical striation and the spine articulations composed of dorsal (DL) and ventral lobes (VL), with an arrowing showing pointing to the distal (di) end of the arm. C. Detail of proximal arm segments in ventral view, showing the striated lateral arm plates (LAP), the arm spines (AS) and the tentacle notches (TN), with an arrowing showing pointing to the distal (di) end of the arm.