Tribrachidium
Tribrachidium heraldicum | |
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Fossil of Tribrachidium heraldicum | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | †Trilobozoa |
Family: | †Tribrachididae Runnegar, 1992 |
Genus: | †Tribrachidium Glaessner, 1959 |
Species: | †T. heraldicum
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Binomial name | |
†Tribrachidium heraldicum Glaessner, 1959
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Synonyms | |
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Tribrachidium heraldicum is a tri-radially
Etymology
The generic name Tribrachidium is derived from combination of the
Occurrence
Tribrachidium fossils were first discovered in the Ediacara Member of the Rawnslay Quartzite,
Description
T. heraldicum is preserved as negative impressions on the base of sandstone beds. These fossils have a circular, three-lobe form, with straight or trefoil-like edges; they are usually covered by numerous radial branched furrows. The central part of the fossil has three hooked ridges ("arms"). The lobes are twisted into weak spirals.[9]
The diameter of specimens ranges from 3 to 40 millimetres (0.3 to 4.0 cm).[10] Its meter-scale distribution was found to be variable occurring both as solitary individuals and in groups.[11]
Feeding Method
In a 2015 study, Rahman et al. proposed that Tribrachidium heraldicum used a rare 'gravity settling' mode of
Reconstruction and affinity
Tribrachidium was originally described by
With the discovery of the closely related Albumares and Anfesta, along with the discoveries of much better-preserved Russian specimens, Mikhail Fedonkin proposed for these animals the new taxon, Trilobozoa – an extinct group of tri-radially symmetrical coelenterate-grade animals.[14][15] Originally, Trilobozoa was erected as a separate class in the phylum Coelenterata, but after Coelenterata was divided into separate phyla Cnidaria and Ctenophora, the Trilobozoa was transferred to the rank of phylum.[16]
M. Fedonkin has shown that the fossil of Tribrachidium is an imprint of the upper side of the animal's body, with some elements of its external and internal anatomy. The radial furrows on the fossil are radial grooves on the surface of the living animal, while the three hooked ridges in central part of the fossil are imprints of cavities within the body.
See also
- Trilobozoa
- Gehlingia
- Albumares brunsae
- Anfesta stankovskii
- List of Ediacaran genera
- Triskelion
References
- ^ Fedonkin, M. A. (1980). "New representative of the Precambrian coelenterates in the northern Russian platform". Paleontologicheskii Zhurnal. 5: 7–15.
- S2CID 245330736.
- ^ a b c Glaessner, M.F.; Daily, B. (1959). "The geology and Late Precambrian fauna of the Ediacara fossil reserve" (PDF). Records of the South Australian Museum. 13 (3): 369–401.
- ^ a b c Glaessner, M.F.; Wade, M. (1966). "The late Precambrian fossils from Ediacara, South Australia" (PDF). Palaeontology. 9 (4): 599.
- ^ Fedonkin, M. A. (1983). "Non-skeletal fauna of Podoloia, Dniester River valley". In Velikanov, V. A.; Asse]eva, E. A.; Fedonkin, M. A. (eds.). The Vendian of the Ukraine (in Russian). Kiev: Naukova Dumka. pp. 128–139.
- ^ Fedonkin M.A. (1978). "New locality of non-skeletal Metazoa in the Vendian of Whinter Coast". Doklady Akademii Nauk SSSR (in Russian). 239 (6): 1423–1426.
- ISBN 978-0-8018-8679-9.
- doi:10.18520/cs/v124/i4/485-490 (inactive 31 January 2024).)
{{cite journal}}
: CS1 maint: DOI inactive as of January 2024 (link - ^ ISBN 978-5-903625-04-8.)
{{cite book}}
: CS1 maint: location missing publisher (link - ^ "Tribrachidium". www.Ediacaran.org. Retrieved 4 June 2021.
- S2CID 257521294.
- PMID 26702439.
- ^ Glaessner, M. F. (1979). "Precambrian". In Robison, R. A.; Teichen, C. (eds.). Treatise on invertebrate paleontology, Part A. Boulder, Colorado, Geological Society of America: University of Kansas Press. pp. 79–118.
- ^ a b Fedonkin, M. A. (1985). "Systematic Description of Vendian Metazoa". In Sokolov, B. S.; Iwanowski, A. B. (eds.). Vendian System: Historical–Geological and Paleontological Foundation, Vol. 1: Paleontology (in Russian). Moscow: Nauka. pp. 70–106.
- ^ Fedonkin, M. A. (1990). "Precambrian Metazoans". In Briggs D.; Crowther P. (eds.). Palaeobiology: A Synthesis (PDF). Blackwell. pp. 17–24. Archived from the original (PDF) on 12 January 2012. Retrieved 24 March 2013.
- ISBN 9780521366151.
External links
- Palaeos dendrogram
- Ediacara Assemblage University of Bristol
- Anatomical Information Content in the Ediacaran Fossils and Their Possible Zoological Affinities, Jerzy Dzik, Instytut Paleobiologii PAN, Twarda 51/55, 00-818 Warszawa, Poland