Fig. 4 in The beginning of a success story: basalmost members of the extant ophiuroid clade from the Silurian of Gotland, Sweden

Fig. 4. Dissociated lateral arm plates and vertebra of ophiuroids from the Silurian of Gotland. A–B. Ophiolofsson immolation gen. et sp. nov., holotype, NRM PAL Ec38328, proximal lateral arm plate in external (A) and internal (B) views. C–D. O. immolation, paratype, NRM PAL Ec38329, median to distal lateral arm plate in external (C) and internal (D) views. E–F. Ophiolofsson archspire gen. et sp. nov., holotype, NRM PAL Ec38330, proximal lateral arm plate in external (E) and internal (F) views. G–H. O. archspire, paratype, NRM PAL Ec38331, median lateral arm plate in external (G) and internal (H) views. I–J. O. archspire, paratype, NRM PAL Ec38332, distal lateral arm plate in external (I) and internal (J) views. K–L. Ophiolofsson hendersonorum gen. et sp. nov., holotype, NRM PAL Ec38333, proximal lateral arm plate in external (K) and internal (L) views. M–N. O. hendersonorum, paratype, NRM PAL Ec38334, median to distal lateral arm plate in external (M) and internal (N) views. O–P. O. hendersonorum, paratype, NRM PAL Ec38335, vertebra in lateral (O) and distal (P) views. Abbreviations: AGSA = ambulacral groove spine articulations; AS = muscle attachment surface; di = distal; do = dorsal; LSA = lateral spine articulations; PB = podial basin; SP = spur; TN = tentacle notch; VAK = vertebral articular knob;WVC = water vessel canal; ZC = zygocondyle; ZS = zygosphene.