Fig. 8

Abactinal, ambulacral and circumoral ossicles of fossil and living pterasterids and peribolasterids. a–c, e, g–m Hansaster trimbachensis (Gale 2011a). a, e, g, h, l, o Abactinal ossicles. Note delicate, elongated pedicels g, h and sites for insertion of inter-abactinal muscles g, l, m NHMUK EE 16,559-64. b, c, i Ambulacral ossicles. NHMUK EE 16,565-7. j, k Circumoral ossicles, NHMUK EE 16,568-9. f Possible radial ossicle of Becuaster fusiliformis gen. nov., sp. nov., NHMUK EE 16,570. d, n, m, p–s Pteraster corynetes Fisher, 1916. d, p, q, s Abactinal ossicles. m, n Circumoral ossicles. r Ambulacral ossicle, actinal view. a–c, e, g–m Lower Oxfordian, Cardioceras bukowskii Subzone, basal Couches de Passage, Andelot-Morval, Jura, France, sample And 1–5 (Fig. 20a). f Lower Oxfordian, Cardioceras praecordatum Subzone, upper Marnes à C. renggeri, Andelot-Morval, Jura, France, sample And 9 (Fig. 20a). Pteraster corynetes, Recent, Philippines. Scale bars equal 0.5 mm (a–d, h–r) and 0.2 mm (e–g, s)