Bomakellia
| Bomakellia | ||||
|---|---|---|---|---|
Reconstruction of Bomakellia kelleri as Rangeomorpha |
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| Temporal occurrence | ||||
| Ediacarium | ||||
| 555 million years | ||||
| Locations | ||||
| Systematics | ||||
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| Scientific name | ||||
| Bomakellia | ||||
| Fedonkin , 1985 | ||||
| species | ||||
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Bomakellia is an extinct animal genus of the Ediacarium , which iscountedamong the Rangeomorpha and has great similarities with the Chinese fossil Paracharnia .
etymology
The generic name Bomakellia is an acronym that is derived from the Russian geoscientist Boris Maximowitsch Keller (1912–1997) ( Bomakellia = Bo ris Ma ksimovič Kell er). The species name kelleri also honors Keller, who made significant contributions to the geology of the Vendium .
Occurrence and first description
Bomakellia kelleri was discovered in the Ust'Pinega formation on the right bank of the Sjusma 5 kilometers from its confluence with the summer coast of the White Sea in northern Russia and was first described scientifically in 1985 by Mikhail Alexandrovich Fedonkin .
description
From bomakellia is so far only a 90 mm long specimen known that a fourfold radial symmetry with an on closer examination Rangea (reminiscent Wedel structure English frond are) to be recognized. The frond consists of four flags and four axis channels that run centrally between the flags. At the base of the stem there is a bulbous extension that can be interpreted as an anchor.
Socialization
Bomakellia can be found together with the following taxa:
Taxonomy
Bomakellia is very similar to Mialsemia semichatovi , which comes from the Yorga formation near Simnije Gory (note: this fossil is possibly just a special taphonomic form of Bomakellia ).
Fedonkin originally classified Bomakellia as belonging to the problematic arthropod class “Paratrilobita”. Wagoner saw Bomakellia as a primitive forerunner of Anomalocaris . He even interpreted back structures in the head area (cephalon) as eyes, according to which Bomakellia was the oldest fossil equipped with visual sense. However, this hypothesis did not receive much approval.
The affinity of Bomakellia to the Rangeomorpha is now considered to be fairly certain. The Chinese fossil Paracharnia is considered the closest relative .
Individual evidence
- ↑ J. Dzik: Possible ctenophoran affinities of the precambrian "sea-pen" Rangea . In: Journal of Morphology . tape 252 , no. 3 , 2002, p. 315-334 , doi : 10.1002 / jmor.1108 .
- ↑ AF Stankovsky include: Vendian of the southeastern White Sea . In: BS Sokolov, MA Fedonkin (ed.): The Vendian system . tape 2 : Regional geology. Springer, New York 1990, p. 71-109 .
- ^ MA Fedonkin: Systematic Description of Vendian Metazoa . In: Vendian System: Historical-Geological and Paleontological Foundation . tape 1 : Paleontology. Nauka, Moscow 1985, p. 70-106 .
- ↑ D. Grazhdankin, A. Seilacher: A re-examination of the Nama-type vendian organism Rangea schneiderhoehni . In: Geol. Mag. Band 142 , no. 4 , 2005, p. 1-12 .
- ^ BM Wagoner: Phylogenic Hypotheses of the Relationships of Arthropods to Precambrian and Cambrian Problematic Fossil Taxa . In: Systematic Biology . tape 45 , no. 2 , 1996, p. 280-293 , doi : 10.2307 / 2413615 .
- ^ G. Fryer: Cambrian animals: evolutionary curiosities or crucible of creation? In: Hydrobiologia . tape 403 , 1999, p. 1-11 , doi : 10.1023 / A: 1003799411987 .