Fig. 6

Plumaster sp., adambulacral ossicles in actinal (a; NHM EE 14022) and abactinal (b; NHM EE 14023) aspects to show exceptional preservation of stereom; scale bars equal 500 μm. Plumaster sp., arm fragment (NHM EE 14024) in actinal (c) and abactinal (d) aspect; note articulating, broken spines. The terminal breaks have irregular surfaces, likely indicating in life or immediately post mortem damage; scale bar equals 500 μm. e Lense composed almost entirely of slightly broken Plumaster ossicles and spines (NHM EE 14025), likely regurgitated by predator, scale bar equals 1 mm. fPlumaster sp., arm fragment (NHM EE 14026) in actinal aspect showing ridge and groove articulation between adjacent adambulacrals, scale bar equals 500 μm. All from the Pliensbachian Davoei Zone of Sedan, Ardennes, France; main echinoderm level, lorry park cutting (a, b) and level A, road cutting (c–f)