Yochelcionella chinensis (Gastropoda: Helcionelliformes) from the Lower Cambrian of Western Mongolia

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Abstract

The fossils of the genus Yochelcionella Runnegar et Pojeta, 1974 from the Salanygol and Khairkhan formations of the Zavkhan structural-facies zone were re-studied as a part of the general revision of malacofauna from the Vendian–Lower Cambrian deposits of Western Mongolia. It was found out that studied strata, in addition to the earlier reported species Y. parva Zhegallo, 1996 and Y. crassa Zhegallo, 1996, contain two other forms identified as Y. chinensis Pei, 1985 and Yochelcionella sp. Y. chinensis has the widest distribution among species of the genus Yochelcionella and can be successfully used to correlate sediments of remote paleobasins. The diagnosis and composition of the genus Yochelcionella are revised, the species Y. chinensis is described.

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About the authors

P. Yu. Parkhaev

Borisyak Paleontological Institute, Russian Academy of Sciences

Author for correspondence.
Email: pparkh@paleo.ru
Russian Federation, Moscow

E. A. Zhegallo

Borisyak Paleontological Institute, Russian Academy of Sciences

Email: pparkh@paleo.ru
Russian Federation, Moscow

D. Dorjnamjaa

Institute of Paleontology, Mongolian Academy of Sciences

Email: pparkh@paleo.ru
Mongolia, Ulan-Bator

References

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2. Fig. 1. Species of the genus Yochelcionella Runnegar et Pojeta, 1974 from the Lower Cambrian of Western Mongolia: a–i – Y. chinensis Pei, 1985: a–c – specimen PIN, No. 3302/1709, inner core (Khairkhan Formation, Shingein-Nuruu section): a – left view, b – oblique view from the left, c – oblique view from the mouth; g – specimen PIN, No. 3302/1940, inner core, left view; d–g – specimen PIN, No. 3302/1705, inner core (Salanigol Formation, Salany-Gol section): d – right view, e – oblique view from behind, g – oblique view from above; h – specimen PIN, No. 3302/1606, inner core, left view (Khairkhan Formation, Shingein-Nuruu section); i – specimen PIN, No. 3302/1881, inner core, right view (Khairkhan Formation, Shingein-Nuruu section); k, l – Yochelcionella sp., specimen PIN, No. 3302/1819 (Khairkhan Formation, Shingein-Nuruu section): k – left view, l – oblique view from above; m–c – Y. parva Zhegallo, 1996 (Khairkhan Formation, Shingein-Nuruu section): m – paratype PIN, No. 3302/1610, inner core, left view; n – specimen. PIN, No. 3302/1806, inner core, right view; o–r – holotype PIN, No. 3302/1609, inner core: o – left view, p – oblique view from above, p – oblique view from behind; s – specimen PIN, No. 3302/1870, inner core, left view; t–c – Y. crassa Zhegallo, 1996 (Khairkhan Formation, Shingein-Nuruu section): t – specimen PIN, No. 3302/1934, inner core, right view; y – specimen PIN, No. 3302/1931, inner core, left view; f–c – paratype PIN, No. 3302/1605, inner core: f – left view, x – oblique view from the front, c – oblique view from the back; h – specimen PIN, No. 3302/1706, inner core, left view.

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3. Fig. 2. Paleogeographic distribution of the species Yochelcionella chinensis Pei, 1985 in the Botomian time of the Early Cambrian; designations: 1 – Northern China (Henan and Shaanxi provinces), 2 – Siberian platform (Eastern Anabar region), 3 – Western Mongolia (Dzabkhan zone), 4 – South Australia (Flinders Ranges), 5 – East Antarctica (Churchill Mountains), 6 – USA (Pennsylvania), 7 – Canada (Western Newfoundland); Designations of the main continents and large terranes: A - Avalonia, AC - Arctic Alaska and Chukotka, Av - Australia, Am - Armorican terranes, An - Annamia, Ar - Arabia, Af - Africa, B - Baltic Platform, VA - East Antarctica, G - Greenland, I - Hindustan, Ib - Iberian Massif, K - Kara microcontinent, KO - Kolyma-Omolon microcontinent, L - Laurentia, M - Madagascar, MT - Mongolian terranes, NG - New Guinea, NZ - New Zealand, Pa - Patagonia, S - Siberian Platform, SK - North China Platform, T - Tarim Block, Ts - Tasmania, JA - South America, SC - South China Platform.

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4. Fig. 3. Stratigraphic distribution of the species Yochelcionella chinensis Pei, 1985 in the Lower Cambrian of the Siberian Platform [14], Northern China [10, 16], Southern Australia [11], Antarctica [19, 20], Eastern Laurentia [12, 13, 17], and Western Mongolia (our data); designations: 1 – zonal assemblages of archaeocyaths, 2 – zonal assemblages of trilobites, 3 – finds of Yochelcionella chinensis; zone abbreviations: A. a. – Archaeocyathus abacus; A. h. – Abadiella huoi; A. t. – Anabarites trisulcatus; B. expansus – Bergeroniellus expansus; C.-E. – Calodiscus–Erbiella; D. anab. – Delgadella anabara; D. l. – Dokodocyathus lenaicus; D. r. – Dokidocyathus regularis; Jud. – Judomia; J.t. – Jugalicyathus tardus; N. sun. – Nochoroicyathus sunnaginicus; P. a. – Purella antiqua; Par. b. – Pararaia bunyerooensis; Par. t. – Pararaia tatei; Prof. – Profallotaspis jakutensis; Red. – Redlichia; Red. ch. – Redlichia chinensis; R.g. – Redlichia guizhouensis; S.f. – Syringocnema favus; S.t. – Spirillicyathus tenuis; W. w. – Warriootacyathus wilkawillinensis.

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