Punctae Lingulids (Brachiopods) of the Silurian of the Chernov Uplift, Northeastern European Russia

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Abstract

The remains of organophosphate brachiopods of the Lingulida order, first discovered in Silurian sediments of the Timan-North Ural region, are described. Individual shell flaps and their fragments were found in the terrigenous-carbonate Wenlock strata of the Padimeytivis River section located in the central part of the Chernova Uplift. The results of comparison with other taxa suggest that the brachiopod remains are close to punctae lingulids of the genus, Lingulipora Gurty. The problem is discussed about early stages of ontogenesis in lingulids.

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About the authors

T. M. Beznosova

Institute of Geology FRC Komi SC UB RAS

Author for correspondence.
Email: beznosova@geo.komisc.ru
Russian Federation, Syktyvkar, 167982

G. T. Ushatinskaya

Borissiak Paleontological Institute, Russian Academy of Sciences

Email: gushat@paleo.ru
Russian Federation, Moscow, 117647

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Supplementary files

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2. Fig. 1. The layout of the Silurian section on the Chernov ridge: 1 – location of Lingulipora? sp. in the basin of the Padimeityvis river.

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3. Fig. 2. Distribution of the main groups of fauna in the Venlok and Ludlov deposits along the Padimeityvis river. Designations: 1-6 – limestone: 2 – clay, 3 – bioturbated, 4 – bioclastic, 5 – lumpy, 6 – micro-layered; 7 – gravelites; 8 – stromatolites; 9 – cephalopods; 10 – brachiopods; 11 – gastropods; 12 – ostracods.

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4. Fig. 3. Dorsal flaps of two genera of lingulids from the Lower Cambrian of the Siberian platform: a, b – Sukharilingula luchininae Ushat., 2012, ex. PIN, No. 4896/10: a – dorsal flap from the outside, general view; b – rear part with a brephic shell, its border with an adult flap and two pairs of low elevations on the sides of the brephic shell with partially preserved bristles; Siberian platform, Sukharikha River; lower Cambrian, Botomsky tier, lower part of the Shumninsky suite; c, g – Eoobolus siniellus (Pelman, 1983), ex. PIN, No. 4349/2008: c – dorsal flap from the outside, general view; d – posterior part of the flap, rudimentary protegulum (?) and brephic shell, the border of the brephic and adult parts of the flap is clearly visible; on the sides of the brephic shell – two pairs of low concepts with tufts of bristles; Siberian platform, Lena river, middle current, location of the “Algal lens"; lower Cambrian Botomsky tier, Sinskaya suite (Ivantsov et al., 2005).

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5. 1-6. Lingulipora? sp.: 1 – copy 712/1: 1a – dorsal flap from the outside; 1b – abdominal flap from the outside, the apical part is broken off; 2 – copy 712/2, dorsal flap from the outside; 3 – copy 712/3, dorsal flap from the outside; 4 – copy 712/4: 4a – dorsal flap from the outside, in the front part is broken off; 4b – the apical part, the protegulum; 5 – copy 712/5: 5a – partially broken dorsal flap from the outside; 5b – the back part of the flap – the protegulum and part of the brephic shell; 6 – copy 712/6: 6a – the dorsal flap from the outside; 6b – a surface area with concentric plates and streams between them; 6b – concentric trickles on the surface of the sash, separate outlets of the pore channels are visible, 6g - the surface of the sash with concentric plates, the ends of which are slightly raised.

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6. Fig. 1, 2. Lingulipora? sp.: 1 – ex. 712/7: 1a – the posterior part of the dorsal flap from the outside, the protegulum is visible, its border with the brephic shell, the brephic shell and partially its border with the adult flap; 1b – the posterior part of the same flap from the inside, very narrow in the apical part of the pseudointerarium, expanding to the sides and bearing several folds; 1b – the same flap, with a different magnification; 1g – protegulum in the apical part of the dorsal flap, indentation in the central part and separate trickles on the sides are visible; 1d – outlets of channels-pores on the inner surface of the dorsal flap; 2 – ex. 712/8, a thin concentric trickle on the the surface of the dorsal flap.

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