New Data on the Microstructure of Tannuolina (Cambrian Zooproblematics)

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A morphological study of phosphate sclerites Tannuolina pavlovi Kouchinsky, Bengtson et Murdock, 2010 from the Kostinskaya Formation section of the Siberian Platform (right bank of the Sukhaya Tunguska River) was carried out. The microstructure of the studied sclerites, the wall of which has a two-layer structure, has been described for the first time.

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作者简介

Y. Demidenko

Borissiak Paleontological Institute, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: juliad@paleo.ru
俄罗斯联邦, Moscow, 117647

G. Karlova

Institute of Petroleum Geology and Geophysics named after A.A. Trofimuk, SB RAS

Email: juliad@paleo.ru
俄罗斯联邦, Novosibirsk, 630090

D. Komlev

Novosibirsk Branch of FSBI VNIGNI

Email: komlev@vnigni.ru
俄罗斯联邦, Novosibirsk, 630007

参考

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  2. Новожилова Н.В., Штайнер М., Коровников И.В., Токарев Д.А. Раннекембрийские томмотииды разреза Хаирхан (Центрально-Тувинский прогиб) // Палеонтол. журн. 2019. № 6. С. 25–30.
  3. Фонин В.Д., Смирнова Т.Н. Новая группа проблематических раннекембрийских организмов и некоторые методы их препарирования // Палеонтол. журн. 1967. № 2. С. 15–27.
  4. Bengtson S. Early skeletal fossils // Neoproterozoic-Cambrian Biological Revolutions / Eds. Lipps J.H., Waggoner B.M. Cambridge: Univ. Press, 2004. P. 67–78 (Paleontol. Soc. Papers. V. 10).
  5. Kouchinsky A., Bengtson S., Murdock D.J.E. A new tannuolinid problematic from the lower Cambrian of the Sukharikha River in northern Siberia // Acta Palaeontol. Pol. 2010. V. 55. № 2. P. 321–331.
  6. Qian Yi, Bengtson S. Palaeontology and biostratigraphy of the Early Cambrian Meishucunian Stage in Yunnan Province, South China // Fossils and Strata. 1989. № 24. P. 1–156.
  7. Skovsted C.B. A silicified tommotiid from the Lower Cambrian of Greenland // Bull. Geosci. 2016. V. 91. № 3. P. 553–559.
  8. Skovsted C.B., Clausen S., Alvaro J.J., Ponleve D. Tommotiids from the Lower Cambrian (Series 2, Stage 3) of Morocco and the evolution of the tannuolinid scleritome and setigerous shell structures in stem group brachiopods // Palaeontology. 2014. V. 57. Pt 1. P. 171–192.

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2. Fig. 1. Tannuolina pavlovi Kouchinsky, Bengtson et Murdock, 2010: a, b – copies. PIN, No. 5083/5264, convex sclerites (mitral): a – a general view of the sclerite from the side, b – an enlarged fragment of the inner layer of the sclerite, layering is visible; c–e – ex. PIN, No. 5083/5182, flattened sclerites (sellate): c – general view of the broken sclerite, d–e – enlarged fragments of the outer surface of the sclerite with large folds with pores and porous-favosite pattern; Siberian platform, incision on the right. the bank of the Sukhaya Tunguska river below the mouth of the stream. Towpath; Tommotsky tier, Kostinsky suite. Designations: vs – inner layer, lp – false pores, hc – outer layer, p – pores, pl – film.

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3. Figures 1-4. Tannuolina pavlovi Kouchinsky, Bengtson et Murdock, 2010: 1 – copy. PIN, No. 5083/5274: 1a – general view of broken flattened sclerite with partial fragments of the outer folded porous layer and the inner layer; 1b–1e – enlarged fragments of the outer surface of sclerite with large pores and a fine–pore pattern; 2-4 – flattened sclerites (sellate): 2 copies. PIN, No. 5083/5240, front-side view; 3 copies. PIN, No. 5083/5274, rear-side view; 4 copies. PIN, No. 5083/5272, general view of the sclerite with fragments of the outer layer; Siberian platform, section on the right. the bank of the Sukhaya Tunguska river, below the mouth of the stream. Towpath; Tommotsky tier, Kostinsky suite. Designations: lp – false pores, p – pores, pl – film.

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4. Figures 1, 2. Tannuolina pavlovi Kouchinsky, Bengtson et Murdock, 2010: 1 – copy. PIN, No. 5083/5187: 1a – a general view of a broken flattened sclerite; the outer surface with wavy ribs is visible; the upper part of the sclerite (crown) is broken off along a horizontal septum, on the surface of which remains of a porous fused double crown of sclerite are visible; 1b, 1b – enlarged fragments of FIG. 1a, top view of a sclerite broken off along the septum with a fused double crown, on which fragments of a folded porous layer are visible; 1g – an enlarged fragment of the outer surface of the sclerite with convex wavy ribs; 2 – copies. PIN, No. 5083/5121: 2a – general view of flattened sclerite; 2b, 2b – enlarged fragments of the outer surface of sclerite with convex wavy ribs; Siberian platform, incision on the right. on the banks of the Sukhaya Tunguska River; Tommotsky tier, Kostinsky suite.

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