Ewin and Thuy—Brittle stars from the British Oxford Clay
787
Figure 4. Enakomusium whymanae n. sp., Coln Quarry, Lechlade, Gloucestershire, UK 51.6951N, 1.7372W; ex situ layer of fissile gray shaly clay from the jason Zone, Peterborough Member, lower Oxford Clay, Callovian, late Middle Jurassic. (1) NHMUK EE 16206 (paratype), dorsal side of disk; (2) NHMUK EE 16207 (paratype), ventral side of arm fragment; (3) NHMUK EE 16208 (paratype), dorsal side of arm fragment; (4) NHMUK EE 16209 (paratype), proximal lateral arm plate in (4.1) external and (4.2) internal views; (5) NHMUK EE 16210 (paratype), median lateral arm plate in (5.1) external and (5.2) internal views and (5.3) with detail of spine articulation; (6) NHMUK EE 16211 (paratype), distal lateral arm plate in (6.1) external and (6.2) internal views. (1–3) Scale bars = 1mm; (4, 5.1, 5.2, 6) scale bar = 200 µm; (5.3) scale bar = 50 µm. CPP = central primary plate; IP = interradial plate; MO = muscle opening; NO = nerve opening; RS = radial shield.
