Fig. 71 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia

Fig. 71. Hexactinellid? spicules from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia. A. Monaxon with bulbous and barbed ends, SMNH Sp 10328, sample 6/0.3; A 1, lateral view; A 2, close-up of the barbed end. B, C, G. Monaxons with a bulbous end. B. SMNH Sp 10329, sample 7/34.7; lateral view. C. SMNH Sp 10330, sample 7/34.7; lateral view. G. SMNH Sp 10331, sample 7/36.7; lateral view. D, F. Nabaviella-like spicules. D. SMNH Sp 10332, sample 7/34.7; D 1, oblique lateral view; D 2, plan view on the radiating rays and broken termination of presumably proximal ray. F. SMNH Sp 10333, sample 7/36.7; F 1, plan view on the radiating rays and rounded tip of presumably proximal ray; F 2, lateral view. E. Hexactine with ribbed and bent rays, SMNH Sp 10327, sample 7/37.8; E 1, plan view on the radiating rays and tip of the ribbed presumably distal ray; E 2, lateral view. Scale bar: 600 μm, except A 2 , D 1 , E, 300 μm. as several hexactines with slim rays, including SMNH Sp 10324–10326, are found in samples 3/46.5, 3/49, 7/33, 7/34.7, and 7/36.7; correlated with the Delgadella anabara Zone, Atdabanian Stage. Emyaksin Formation, Malaya Kuonamka and Bol'shaya Kuonamka rivers.