Ewin and Thuy—Brittle stars from the British Oxford Clay
789
Figure 5. Enakomusium weymouthiense (Damon, 1880), Callovian of Liesberg, Switzerland, specimens from the original material of Hess (1963). (1) Proximal lateral arm plate in (1.1) external and (1.2) internal views; (2) median lateral arm plate in (2.1) external and (2.2) internal views; (3) distal lateral arm plate in
(3.1) external and (3.2) internal views. Aspidophiura? seren new species, Coln Quarry, Lechlade, Gloucestershire, UK 51.6951N, 1.7372W; ex situ layer of fissile gray shaley clay from the jason Zone, Peterborough Member, lower Oxford Clay, Callovian, late Middle Jurassic. (4) NHMUK EE 16212 (holotype), proximal lateral arm plate in (4.1) external and (4.2) internal views and (4.3) with detail of spine articulations; (5) NHMUK EE 16213 (paratype), median lateral arm plate in (5.1) external and (5.2) internal views; (6) NHMUK EE 16214 (paratype), proximal lateral arm plate in (6.1) external and (6.2) internal views; (7) NHMUK EE 16215 (paratype), distal lateral arm plate in (7.1) external and (7.2) internal views and (7.3) with detail of spine articulations. (1–4.2, 4.4–7.2) Scale bars = 200 µm; (4.3, 7.3) Scale bars = 100 µm. MO = muscle opening; NO = nerve opening; TN = tentacle notch.
