Fig. 64 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia

Fig. 64. Edrioasteroid thecal-plates from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia. A. SMNH Ec 31511, sample 7/70; view of triangular-surface of a thecal-plate with 6 ridges radiating from concave base (at the top). B. SMNH Ec 31512, sample 7/70; B1, view of triangular surface with 4 ridges radiating from the concave base (at the top); B2, view of the opposite, smooth triangular surface; B3, lateral view (peripheral rim of concave base arrowed) of the claw-like plate. C. SMNH Ec 31513, sample 7/70; C1, oblique view of concave base (peripheral rim arrowed) and triangular surface bearing radiating ridges; C2, lateral view. D. SMNH Ec 31514, sample 7/70; view of triangular, ridged surface and perpendicular concave base (rim arrowed). E. SMNH Ec 31515, sample 7/70; view of trapezoidal surface with faint ridges and perpendicular, rimmed concave-base (to the top). F. SMNH Ec 31516, sample 7/64; view of faintly ridged surface and concave base (at the top). G. Edrioasteroid ambulacral plate, SMNH Ec 31517, sample 7/70; G1, upper view (lateral sutural pore/gap arrowed); G2, oblique view (lateral, abradial? prong arrowed). Scale bar: 600 μm, except G, 300 μm.