Fig. 57 in Early-middle Cambrian stratigraphy and faunas from northern Siberia

Fig. 57. Paleoscolecid Hadimopanella knappologica (Bengtson, 1977) from the lower Cambrian Erkeket Formation, Khorbusuonka River, Siberia, Russia; samples 19/5.5 (A–F) and 20/1B (G–L). A–L. Disarticulated sclerites, SMNH X11245–11256, respectively. A, B2, D2, E–K, apical view; B1, C, D1, L, oblique apical view. Scale bar 100 µm. Type material: Disarticulated calcium phosphatic sclerites: Holotype Type horizon: Erkeket Formation, ca. 30 m below the Kuonamka For- SMNH X11257 (Fig. 58A) and paratypes SMNH X11258–11260, mation, Toyonian Stage (correlated with the Cambrian Stage 4). 11262–11265 (Fig. 58B–D, F–I), from the type locality and horizon. Type locality: Locality 19/31.75 (71°28.8'N, 123°50.0'E) on the left Material.—Several hundred calcium phosphate sclerites, in bank of the Khorbusuonka River, ca. 20 km downstream of the mouth addition to the type series, from samples 19/31.75, 19/33, of the Mattaia River, northern Siberia, Russia. 19/40, 19/43.25, 19/46.5, 20/5B, 20/6B, Khorbusuonka River,