Fig. 37 in Early-middle Cambrian stratigraphy and faunas from northern Siberia

Fig. 37. Sclerites of chancelloriid Archaeopetasus pachybasalis Kouchinsky sp. nov., from the lower Cambrian Tyuser Formation, lower reaches of the Lena River, Siberia, Russia; sample 21/21. Holotype specimen, SMNH X11113. A1, upper view; A2, A3, lateral view; A4, lower surfaces of sclerite. Scale bar 500 µm.