Fig. 63. Eocrinoid brachiolar B in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia

Fig. 63. Eocrinoid brachiolar B (A–D) and brachioliferous (J, K) plates, with associated uniserial brachitaxial (E–H) and axillary (I) plates of unknown affinity from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sample 7/70. A. Axial view of brachiolar plate ( oral groove to the right) with longitudinal articulation surfaces arrowed, SMNH Ec 31500. B. Brachiolar plate with a low length-to-width ratio and concave distal and proximal articulation surfaces, SMNH Ec 31501; B 1 , axial view (longitudinal articulation surfaces arrowed); B 2 , lateral view (oral groove to the left in B 1 and B 2). C. Brachiolar plate with almost triangular lateral articulation, SMNH Ec 31502; C 1, lateral view of longitudinal articulation and oral groove (to the left); C 2, oblique view of concave axial-facets and longitudinal articulation surfaces (arrowed). D. Elongated brachiolar plate with almost straight, posterior longitudinal articulation, SMNH Ec 31503; D 1, lateral view of longitudinal articulations (arrowed) and oral groove (to the right); D 2, oblique view of slightly depressed axial-articulation (oral groove to the right). E. Brachial unbranched ossicle (brachitaxis) with oval aboral canal, →