Fig. 25 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. 25. Fossil skeletal plates and articulated arm fragments of ophiacanthid brittle stars; lateral arm plates (LAPs) in external (a) and internal (b) views. 1-3. Alternacantha dilionessa sp. nov. from the early Kimmeridgian of the Pointe du Chay, France. 1. GZG.INV.78666 (paratype), arm spine. 2. GZG. INV.78667 (paratype), median arm fragment in ventral view. 3. GZG.INV.78668 (paratype), proximal arm fragment in lateral (a) and dorsal (b) views. 4-5. Dermocoma subtilirugosa (Kristan-Tollmann & Gramann, 1992) comb. nov. from the Rhaetian (Late Triassic) of Fischerwiese, Austria. 4. GZG.INV.78671, proximal LAP. 5. GZG.INV.78672, median LAP. 6. Dermocoma sp. nov. innom. 1 from the Rhaetian (Late Triassic) of Fischerwiese, Austria; GZG.INV.78674, median LAP. One common scale bar per species except for 1.