Fig. 23 in Temporary expansion to shelf depths rather than an onshore-offshore trend: the shallow-water rise and demise of the modern deep-sea brittle star family Ophiacanthidae (Echinodermata: Ophiuroidea)

Fig. 23. Fossil lateral arm plates in external (a) and internal (b) views and articulated arm fragments of Alternacantha schwermannorum sp. nov. from the late Oxfordian (Late Jurassic) of Savigna, France. 1. GZG.INV.78654 (holotype), proximal LAP. 2. GZG.INV.78655 (paratype), median LAP. 3. GZG. INV.78656 (paratype), distal LAP. 4. GZG.INV.78657 (paratype), proximal arm fragment in ventral (a) and dorsal (b) views and with detail in dorso-lateral (c) view. 5. GZG.INV.78658 (paratype), distal arm fragment in dorsal (a) and ventral (b) view. One common scale bar for 1-3.