Fig. 4
Arenorbis santameraensis sp. nov. from the upper Sinemurian of the Punta La Llastra W section, Villaviciosa (Asturias, north-west Spain); paratype (MUJA-0511); a general view of specimen exposing dorsal side; b detail of radial shields; c detail of proximal arm segments; d detail of distal arm segments. AS arm spines DAP dorsal arm plates G disc granules LAP lateral arm plates RS radial shields