Hagionella cultrata ( Missarzhevsky, 1977 )

Kouchinsky, Artem, Bengtson, Stefan, Clausen, Sébastien & Vendrasco, Michael J., 2015, An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia, Acta Palaeontologica Polonica 60 (2), pp. 421-512 : 477

Hagionella cultrata ( Missarzhevsky, 1977)

Fig. 53G, I, J .

Material.—Single fragment SMNH X 4768 from sample 7/39.5; two specimens, including SMNH X 4769, from sample 7/47.5; Emyaksin Formation, Bol’shaya Kuonamka riv- er; correlated with the Delgadella anabara Zone,Atdabanian Stage. Three sclerites, including SMNH X 4770, from sample 1/9; carbonate concretions of the basal Kuonamka Formation, Malaya Kuonamka River; Bergeroniellus expansus Zone , upper Botoman Stage.

Description.—Gently curved, simple, laterally narrowed and bilaterally symmetrical calcium phosphatic sclerites. The convex side forms a longitudinal median flange. The internal cavity extends to the apex.

Stratigraphic and geographic range.— Hagionella cultrata is known from the Atdabanian Stage (Stage 3; Missarzhevsky 1977 and herein) and Cambrian Stage 5 of Siberia ( Kouchinsky et al. 2011), Series 2 of Kazakhstan ( Bengtson 1983), lower–middle Cambrian of South and North China (see Qian et al. 2004; Li et al. 2004a; Steiner et al. 2007), middle Cambrian of Baltica ( Bengtson 1976) , upper Series 2 of Laurentia (John S. Peel, personal communication 2010), and probably Avalonia, Britain ( Hinz 1987).

Figures

Fig. 53. Protoconodonts from lower Cambrian basal Kuonamka Formation, Malaya Kuonamka River and Emyaksin Formation, Bol’shaya Kuonamka River, Anabar Uplift, Siberia. A–D. Gapparodus bisulcatus (Müller, 1959), sample 1/9. A. SMNH X 4764; A 1, view on the longitudinally concave side and basal opening of sclerite; A 2, lateral view. B. SMNH X 4765; B 1, lateral view; B 2, view on the longitudinally concave side. C. SMNH X 4766; C 1, lateral view; C , oblique view on the longitudinally concave side and basal opening of sclerite; C , view on the longitudinally concave side. D. SMNH X 4767; D 1, lateral view; D 2, close-up of basal part of D 1. E. Amphigeisina danica (V. Poulsen, 1966), SMNH X 4763; sample 1/9; E 1, view on the basal →