Cephalonega
Cephalonega stepanovi | |
---|---|
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | †Proarticulata |
Class: | †Cephalozoa |
Genus: | †Cephalonega Ivantsov et al., 2019 |
Species: | †C. stepanovi
|
Binomial name | |
†Cephalonega stepanovi (Fedonkin, 1976[1])
| |
Synonyms | |
Onega stepanovi Fedonkin, 1976 |
Cephalonega stepanovi is a fossil organism from Ediacaran deposits of the
Name
Its original genus name Onega comes from the
Morphology
The small fossils, which range up to 7 millimetres (0.28 in) long, have oval outlines and low bodies with an articulated central zone built of isomers encircled by an undivided zone. The surface of the undivided region of Cephalonega is covered with small tubercles.[5]
Cephalonega was originally described by Mikhail Fedonkin as a problematic organism, being grouped together with
In 1985 Mikhail Fedonkin erected
Andrey Yu. Ivantsov has proposed that Cephalonega should be placed in the phylum Proarticulata, as the segments in recently discovered, exceptionally well-preserved fossils display the glide, or "staggered", symmetry characteristic of the majority of proarticulatans.[5]
According to a 2019 study, all Cephalonega researchers agree that it is proarticulatan and put it in the class Cephalozoa that also includes e.g. Yorgia, Andiva and Spriggina.[3]
Fossil record
Imprints of Cephalonega stepanovi have been found in the Verkhovka and Zimnie Gory Formations
All the fossil specimens are negative imprints on the bases of fine-grained sandstone beds with the "elephant skin" and tubercle texture diagnostic of microbial mats.[10]
The same bedding planes contain various other Ediacaran species:
See also
References
- ^ a b c B. M. Keller & M. A. Fedonkin (1976). Новые находки окаменелостей в валдайской серии докембрия по р. Сюзьме [New Records of Fossils in the Valdaian Group of the Precambrian on the Syuz'ma River] (PDF). Izv. Akad. Nauk SSSR, Ser. Geol. (in Russian). 3: 38–44. Archived from the original (PDF) on 2007-09-27.
- ^ Keller, B.M.; Menner, V.V.; Stepanov, V.A. & Chumakov, N.M. (1974). "Новые находки Metazoa в вендомии Руссой платформы" [New Finds of Metazoa in the Vendomii of the Russian Platform] (PDF). Izvestiya Akademii Nauk SSR. Seriya Geologicheskaya (in Russian). 12: 130–134. Archived from the original (PDF) on 7 February 2007.
- ^ a b
Ivantsov, A.Y.; Fedonkin, M.A.; Nagovitsyn, A.L.; Zakrevskaya, M.A. (2019). "Cephalonega, a new generic name, and the system of Vendian Proarticulata". Paleontological Journal. 53 (5): 447–454. S2CID 203853224.
- ^ Ivantsov, Andrey; Nagovitsyn, Aleksey; Zakrevskaya, Maria (2019). "Traces of locomotion of Ediacaran macroorganisms". Geosciences. 9 (9). Article 395. .
- ^ S2CID 86636748.
- ^ a b M. A. Fedonkin (1985). "Systematic Description of Vendian Metazoa". Vendian System: Historical–Geological and Paleontological Foundation, Vol. 1: Paleontology. Moscow: Nauka, pp. 70–106.
- ^ Stefan Hengtson; Mikhail A. Fedonkin; Jere H. Lipps. (1992). "The Major Biotas of Proterozoic to Early Cambrian Multicellular Organisms". In: Edited by J. William Schopf; Cornelis Klein. Proterozoic Biosphere. Cambridge University Press, pp. 433–435.
- ^ D. V. Grazhdankin (2003). "The Structure and Sedimentation Conditions in the Vendian assemblage in the Southeastern White Sea" (PDF). Stratigraphy and Geological Correlation. 11 (4): 313–331. Archived from the original (PDF) on 2007-08-04. Retrieved 2008-11-04.
- S2CID 129376371. Archived from the original(PDF) on 2007-02-26. Retrieved 2008-11-04.
- JSTOR 3515360.