Fig. 9

Primary radial ossicles of fossil and extant pterasterids. a, b, f–h Hansaster trimbachensis (Gale 2011a). a, b Complete pr, base slightly coated with calcite cement, distal a and proximal b views. NHMUK EE 16,571. f–h, Well-preserved pr, in distal a, lateral b and proximal c views. NHMUK EE 16,572. c–e, i, j, r, Propteraster amourensis gen. nov., sp. nov. c–e Well-preserved pr, in proximal c, lateral d and distal e views. Holotype, NHMUK EE 16,573. I, J, R, pedicels with base broken off, proximal aspect. NHMUK EE 16,574–6. Paratypes. k–m Pteraster coynetes Fisher, 1916. Recent, Phillippines. Pr in distal k, proximal l) and abactinal m views. o–q Pteraster temnochiton Fisher, 1910. Recent, Alaska. n, s Pteraster acicula Downey, 1970. Pr in distal n and proximal o views, Recent, Florida. a, b, f–h, lower Oxfordian, Cardioceras bukowskii Subzone, basal Couches de Passage, Andelot-Morval, Jura, France, sample And 1–5 (Fig. 20a). c–e, i, j, r Lower Oxfordian, Cardioceras praecordatum Subzone, upper Marnes à C. renggeri, Andelot-Morval, Jura, France, sample And 9 (Fig. 20a). bp, basal part of pr. co, column of pr, divided into shaft, s and head, h. pp, proximal process, dp, distal process. pc, proximal cavity. Ps, proximal spur for insertion of muscles depressing spines. Scale bars equal 0.5 mm (a–h, k–m, o–q) and 0.2 mm (j, n, r, s)