Pomoria

Pomoria; Temporal range: Ediacaran
	artist's reconstruction
Scientific classification
Kingdom:	Animalia
(unranked):	?Cnidaria/?Trilobozoa
Genus:	Pomoria; Fedonkin, 1980
Species:	P. corolliformis
Binomial name
	Pomoria corolliformis; Fedonkin, 1980

Pomoria corolliformis is an Ediacaran fossil that Mikhail Fedonkin described as resembling a modern-day sea anemone. The only known fossil specimen appears to have a long, gut-like tube that connects to its mouth and have circular protrusions that resemble modern cnidarian tentacles.

Description

P. corolliformis has tri-radial symmetry, leading to its identification as a trilobozoan.[1] The prenutal fin is surrounded by the projecting manubrium. The manubrium, the tube bearing the mouth of a coelenterate, is described as being quite long, with a lateral cross section showing lateral semicircular protrusions. The thickness of the manubrium is 2 or 3 times the thickness of the tentacle.[2]

Diversity

Pomoria corolliformis is the only species that has been described.[2]

Discovery

Mikhail Fedonkin first described Pomoria in 1980 in his publication in Palaeontology, New representation of the Precambrian. Fedonkin found Pomoria in the northern Russia platform in the Vendian Complex.[2][3]

Distribution

The only known specimen, representing two individuals situated closely together, is from the Late Precambrian-aged Winter Shore of the White Sea, Russia.

Significance

Pomoria went extinct during the late Ediacaran and can be regarded as an example of the "evolutionary failure" of triradial symmetry.[1]

References

Droser, Mary L.; Tarhan, Lidya G.; Gehling, James G. (2017). "The Rise of Animals in a Changing Environment: Global Ecological Innovation in the Late Ediacaran". Annual Review of Earth and Planetary Sciences. 45 (1): 593–617. doi:10.1146/annurev-earth-063016-015645. ISSN 0084-6597.
Fedonkin, M. A. (1980). "New representative of the Precambrian coelenterates in the northern Russian platform". Paleontologicheskii Zhurnal. 5: 7–15.
De, C.; Prasad, S. (2004). "Discovery of Vendian Ediacaran fossil assemblage from the Marwar Super group, Rajasthan, India". Indian Journal of Geosciences. 65 (3): 241–242.

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[Droser_2017-1] Droser, Mary L.; Tarhan, Lidya G.; Gehling, James G. (2017). "The Rise of Animals in a Changing Environment: Global Ecological Innovation in the Late Ediacaran". Annual Review of Earth and Planetary Sciences. 45 (1): 593–617. doi:10.1146/annurev-earth-063016-015645. ISSN 0084-6597.

[Fedonkin_1980-2] Fedonkin, M. A. (1980). "New representative of the Precambrian coelenterates in the northern Russian platform". Paleontologicheskii Zhurnal. 5: 7–15.

[3] De, C.; Prasad, S. (2004). "Discovery of Vendian Ediacaran fossil assemblage from the Marwar Super group, Rajasthan, India". Indian Journal of Geosciences. 65 (3): 241–242.