Anfesta
| Anfesta | ||||||||
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Anfesta stankovskii |
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| Temporal occurrence | ||||||||
| Ediacarium | ||||||||
| by 558 million years | ||||||||
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| Systematics | ||||||||
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| Scientific name | ||||||||
| Anfesta | ||||||||
| Fedonkin , 1984 | ||||||||
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Anfesta stankovskii is a three- ray (triradial) symmetrical fossil of the late Ediacarian . It belongs to the extinct family Albumaresidae ofthe trilobozoa tribe .
etymology
Both the generic name Anfesta and the species name stankovskii honor the Archangel geologist Anatoli Fjodorowitsch Stankowski ( Anfesta consists of the acronym AnFeSta of the name An atolij Fë dorovič Sta nkovskij).
Occurrence
Fossils of anfesta stankovskii stankovskii were on the Onega Peninsula in the deposits of at Kharakta located Verkhovka- and Yorga lineup discovered. They can also be found on Simni Bereg , the winter coast of the White Sea ( Arkhangelsk Oblast , Russia ).
description
The Anfesta fossils are preserved as flat negative prints on the slightly pyritic underside of sandstone banks. They are circular, three-lobed and are surrounded by a straight edge. The surface is criss-crossed by dendritic furrows that emanate from three oval radial ridges in the center and can be followed to the edge where they branch. The diameter varies between 5 and 18 millimeters. The three lobes are evenly arranged and not twisted as in the related Taxa Albumares and Tribrachidium .
Reconstruction and Family Relationships
Anfesta was originally described by Mikhail Alexandrowitsch Fedonkin as a free-swimming medusa comparable to the umbrella jellyfish (Scyphozoa) . The branched furrows on the surface were interpreted as impressions of a radial canal system, while the three oval ridges were viewed as gonads. Alternatively, the three oval backs are interpreted as impressions of body cavities. It is believed that the furrow and back system may also have been related to food intake and digestion.
In 1986 Fedonkin put the fossils anfesta stankovskii , albumares and tribrachidium for newly built group of trilobozoa , the three-lobed, radially symmetrical, the hollow animals (coelenterates) equivalent undertaking contained that only superficially the cnidarians are similar (Cnidaria). The Trilobozoa originally formed a class within the tribe of the Coelenterata. But as the coelenterates later in the tribes Cnidaria and Ctenophora were divided (Ctenophora), the trilobozoa to the rank of a tribe had to be collected.
Habitat
According to the latest research results, Anfesta was a benthic soft-body animal that temporarily lingered on a substrate made of microbe mats , but was not permanently bound to it.
Individual evidence
- ^ Ivantsov, AY: New Proarticulata from the Vendian of the Arkhangel'sk Region . In: Paleontological Journal . tape 38 (3) , 2004, p. 247-253 .
- ↑ a b Ivantsov, AY and Leonov, MV: The imprints of Vendian animals - unique paleontological objects of the Arkhangelsk region (in Russian) . Arkhangelsk 2009, ISBN 978-5-903625-04-8 , pp. 91 .
- ↑ Fedonkin, MA: Promorphology of the Vendian Radialia . Ed .: Sokolov, BS and Iwanowski, AB Stratigraphy and Paleontology of the Earliest Phanerozoic. Nauka, Moscow 1984, p. 30-58 .
- ↑ Fedonkin, MA: Systematic Description of Vendian Metazoa . Ed .: Sokolov, BSund Iwanowski, AB Vendian System: Historical-Geological and Paleontological Foundation, Vol.1: Paleontology. Nauka, Moscow 1985, p. 70-106 .
- ↑ Fedonkin, MA: Precambrian Metazoans . Ed .: Briggs D. and Crowther P. Palaeobiology: A Synthesis. Blackwell, 1990, pp. 17-24 .
- ↑ RUNNEGAR, BNund Fedonkin, MA: Proterozoic Metazoan Body Fossils . Ed .: Schopf, JW and Klein, C. The Proterozoic Biosphere: A Multidisciplinary Study. Cambridge University Press, 1992, pp. 373 .