Annulatubus

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.

Annulatubus
Scientific classification
Kingdom: Animalia (?)
Genus: †Annulatubus
Species:
†A. flexuosus
Binomial name
†Annulatubus flexuosus

Description

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 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]

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See also

References
  1. Carbone, Calla; Narbonne, Guy; Macdonald, Francis; boag, Thomas (2015). "New Ediacaran fossils from the uppermost Blueflower Formation, northwest Canada: disentangling biostratigraphy and paleoecology". Journal of Paleontology. 89 (2): 281–291. doi:10.1017/jpa.2014.25.
  2. Grazhdankin, Dmitriy; Balthasar, Uwe; Nagovitsin, Konstantin; Kochnev, Boris (2008). "Carbonate-hosted Avalon-type fossils in arctic Siberia". Geology. 36 (10): 803–806. Bibcode:2008Geo....36..803G. doi:10.1130/G24946A.1.
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