Английская Википедия:Annulatubus

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Annulatubus is a genus of the Ediacaran biota (635-542 Ma) found in Northwest Canada, and Northern Siberia. It has been found in both shallow water and deep-water assemblages no older than 560 Ma placing it within the youngest Ediacaran.

Morphology

Annulatubus, meaning ringed tube, possesses a long tube-like structure with uniformly spaced ridges. At lengths between 178mm, and 250mm, and widths between 15mm and 50mm it is significantly larger than most other tube-like fossils of the Ediacaran.

It is described as having a similar ringed tube structure to Sekwitibulus but differs in size and ridge shape. It is unknown if Annulatubus possessed a holdfast like other similar Ediacarans.[1]

Diversity

The only known species within the genus is Annulatubus flexuosus.[1]

Discovery

Annulatubus flexuosus was discovered in the Blueflower formation from the Mackenzie Mountains of Northwest Canada.[1] In 2008 a similar Ediacaran was discovered from the late Ediacaran Khatyspyt formation of Northern Siberia by Dmitriy V. Grazhdankin, Uwe Balthasar, Konstantin E. Nagovitsin, and Boris B. Kochnev. Carbone et al.[2] recognized the specimen that Grazhdankin et al. described as belonging to the Annulatubus genus but not enough material exists to recognize it as A. flexuosus or a new species.

Distribution

Annulatubus has been found in the sandstone beds of the Blueflower Formation in Northwest Canada and within the mudstones of the Khatyspyt Formation of Northern Siberia.[2]

Ecology

The lifestyle of Annulatubus is unknown other than it has been found in both shallow and deep-water deposits.[1]

See also

References

Шаблон:Reflist

Шаблон:Taxonbar