Fig. 3
Arenorbis santameraensis sp. nov. from the upper Sinemurian of the Punta La Llastra W section, Villaviciosa (Asturias, north-west Spain); holotype (MUJA-1215); a general view of specimen exposing the ventral side; b detail of disc; c detail of mouth skeleton; d detail of ventral interradius; e detail of proximal arm segments; f detail of distal arm fragments. AOS adoral shield AoSS adoral shield spine AS arm spines G disc granules IPa infradental papillae LAP lateral arm plate LPa lateral oral papillae LyO Lyman’s ossicle OS oral shield TPa tooth papillae TS tentacle scales VAP ventral arm plate 1VAP first ventral arm plate