Biology:Palaeopascichnida

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Palaeopascichnida is a proposed group, which includes all known elongated, agglutinating organisms from the Ediacaran period. The term was first used in 2009 by Grazhdankin & Maslov.

Description

A specimen of Orbisiana spumea

Palaeopascichnids are agglutinating organisms, which primarily composed of globular or sausage-shaped chambers, with occasional branches seen in a majority of specimens.[1]

They were originally described as trace fossils, but further studies found this to not be the case, due to the branching of the fossils and some also being disarticulated, with chambers found separated from the rest of the body.[1] Some studies have even suggested a probably foraminiferan affinity for the palaeopascichnids.[2][3]

Distribution

Palaeopascichnids are very widespread, being found across the globe, from the East European platform (White Sea,[4] Urals,[5] Moscow syneclise, Podolia,[6] Finnmark[7]), to Siberia (Olenyok uplift, Uchur-Maya basin[8]), South China (Lantian,[9] Dengying[10] ), Australia (Flinders Ranges[11]), India (Tethys[12]), Avalonia (Charnwood,[13] Newfoundland and Labrador[14]), Romania (Histria Formation[15]), Brazil (Itajaí Basin[16]), and Oman (Fara Formation[17]).

Taxonomy

If ratified, the group would include the following genera and species:[18]

  • Genus Palaeopascichnus Palij, 1976
    • P. delicatus Palij, 1976
    • P. linearis Fedonkin, 1976
    • P. gracilis Fedonkin, 1985
  • Genus Orbisiana Sokolov, 1976
    • O. simplex Sokolov, 1976
    • O. intorta Kolesnikov & Desiatkin, 2022
    • O. spumea Kolesnikov & Desiatkin, 2022
  • Genus Curviacus Shen et al., 2017
    • C. ediacaranus Shen et al., 2017

See also

  • List of Ediacaran genera

References

  1. ↑ 1.0 1.1 Grazhdankin, Dmitriy (March 2014). "Patterns of Evolution of the Ediacaran Soft-Bodied Biota". Journal of Paleontology 88 (2): 269–283. doi:10.1666/13-072. 
  2. ↑ Seilacher, Adolf; Grazhdankin, Dmitri; Legouta, Anton (2003). "Ediacaran biota: The dawn of animal life in the shadow of giant protists". Paleontological Research 7 (1): 43–54. doi:10.2517/prpsj.7.43. 
  3. ↑ Kolesnikov, Anton V; Rogov, Vladimir I; Bykova, Natalia V; Danelian, Taniel; Clausen, Sébastien; Maslov, Andrey V; Grazhdankin, Dmitriy V (2018). "The oldest skeletal macroscopic organism Palaeopascichnus linearis". Precambrian Research 316: 24–37. doi:10.1016/j.precamres.2018.07.017. Bibcode: 2018PreR..316...24K. 
  4. ↑ Fedonkin, M. A. (1981). Keller, B. M.. ed. "White Sea biota of Vendian: Precambrian non-skeletal fauna in the Russian Platform North". Transactions of the Geological Institute (Moscow: Nauka) 342: 1–100. 
  5. ↑ Becker, Yu.R. & Kishka, N.V. (1989). "Открытие эдиакарской биоты на Южном Урале". in T.N. Bogdanova & L.I. Khozatsky (in ru). Теоретические и прикладные аспекты современной палеонтологии. Тезисы докладов XXXIII сессии. Всесоюзного палеонтологического общества.. Leningrad: Nauka. pp. 109–120. http://www.geokniga.org/bookfiles/geokniga-teoreticheskie-i-prkladnye-aspekty-soveremennoy-paleontologii.pdf. Retrieved 2019-08-08. 
  6. ↑ Palij, V.M. (1976). "Ostatki besskeletnoy fauny i sledy zhiznedeyatel'nosti iz otlozheniy verkhnego dokembriya i nizhnego kembriya Podolii" (in ru). Paleontologiya i stratigrafiya verkhnego dokembriya i nizhnego paleozoya yugo-zapada Vostochno-Yevropeyskoy platformy. Kiev: Naukova Dumka. pp. 63–77. 
  7. ↑ Högström, AES; Jensen, S; Palacios, T; Ebbestad, JOR (2013). "New information on the Ediacaran-Cambrian transition in the Vesteranda Group, Finnmark, northern Norway, from trace fossils and organic-walled microfossils". Norwegian Journal of Geology 93: 95–106. 
  8. ↑ Ivantsov, A. Yu. (2017). "Finds of Ediacaran-type fossils in Vendian deposits of the Yudoma Group, eastern Siberia". Doklady Earth Sciences 472 (2): 143–146. doi:10.1134/S1028334X17020131. Bibcode: 2017DokES.472..143I. 
  9. ↑ Yan, Y.; Jiang, C.; Zhang, S.; Du, S.; and Bi, Z. (1992). "Research of the Sinian System in the region of western Zhejiang, northern Jiangxi, and southern Anhui provinces". Bull. Nanjing Inst. Geol. Mineral Res. (Chinese Acad. Geol. Sci.) Supplementary Issue 12: 1–105. 
  10. ↑ Shen, B.; Xiao, S.; Zhou, C.; Dong, L.; Chang, J.; Chen, Z. (2017). "A new modular palaeopascichnid fossil Curviacus ediacaranus new genus and species from the Ediacaran Dengying Formation in the Yangtze Gorges area of South China". Geological Magazine 154 (6): 1257–1268. doi:10.1017/S001675681700036X. Bibcode: 2017GeoM..154.1257S. 
  11. ↑ Glaessner, M. F. (1969). "Trace fossils from the Precambrian and basal Cambrian". Lethaia 2 (4): 369–393. doi:10.1111/j.1502-3931.1969.tb01258.x. Bibcode: 1969Letha...2..369G. 
  12. ↑ Parcha, S. K.; Pandey, S. (2011). "Ichnofossils and their significance in the Cambrian succession of the Parahio Valley in the Spiti Basin, Tethys Himalaya, India". Journal of Asian Earth Sciences 42 (6): 1097–1116. doi:10.1016/j.jseaes.2011.04.028. Bibcode: 2011JAESc..42.1097P. https://doi.org/10.1016/j.jseaes.2011.04.028. 
  13. ↑ Cope, JCW (1982). "Precambrian fossils of the Carmarthen area, Dyfed". Nature in Wales 1: 11–16. 
  14. ↑ Hawco, JB; Kenchigton, CG; McIlroy, D (2021). "A quantitative and statistical discrimination of morphotaxa within the Ediacaran genus Palaeopascichnus" (in en). Papers in Palaeontology 7 (2): 657–73. doi:10.1002/spp2.1290. Bibcode: 2021PPal....7..657H. 
  15. ↑ Saint Martin, J.-P.; Charbonnier, S.; Saint Martin, S.; Cazes, L.; André, J.-P. (2025). "New records of Palaeopaschichnus Palij, 1976 from the Ediacaran of Romania". Geodiversitas 47 (1): 1–16. doi:10.5252/geodiversitas2025v47a1. https://sciencepress.mnhn.fr/en/periodiques/geodiversitas/47/1. 
  16. ↑ Becker-Kerber, Bruno; Paim, Paulo Sergio Gomes; Chemale Junior, Farid; Girelli, Tiago Jonatan; da Rosa, Ana Lucia Zucatti; Albani, Abderrazak El; Osés, Gabriel Ladeira; Prado, Gustavo M.E.M. et al. (August 2020). "The oldest record of Ediacaran macrofossils in Gondwana (~563 Ma, Itajaí Basin, Brazil)". Gondwana Research 84: 211–228. doi:10.1016/j.gr.2020.03.007. 
  17. ↑ Pinto, André Jorge; Álvarez-Lloret, Pedro; Callegari, Ivan; Scharf, Andreas (July 2025). "An Ediacaran trace-like body fossil of a Palaeopascichnus specimen from Oman under 3D micro-tomography". Facies 71 (3). doi:10.1007/s10347-025-00705-5. 
  18. ↑ Kolesnikov, A. V.; Desiatkin, V. D. (2022). "Taxonomy and palaeoenvironmental distribution of palaeopascichnids". Geological Magazine (Cambridge University Press) 159 (7): 1175–1191. doi:10.1017/S0016756822000437. Bibcode: 2022GeoM..159.1175K. https://doi.org/10.1017/S0016756822000437. 

Wikidata ☰ Q111753287 entry



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