Vaveliksia
| Vaveliksia Temporal range: Ediacaran
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| File:Vaveliksia velikanovi.jpg | |
| Artist's reconstruction of V. velikanovi | |
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Vaveliksia
Fedonkin, 1983
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Vaveliksia is a genus of sponges or sponge-like organisms from the Ediacaran.
Etymology
The generic name Vaveliksia and name of type species V. velikanovi are given in honour of Ukrainian geologist Vyacheslav A. Velikanov.
The specific name of V. vana from the Latin vana (incorporeal).[1]
Occurrence
Vaveliksia velikanovi fossils were found in the Lomozov Beds of the Mogilev Formation in the Dniester River Basin, and in Bernashevka Beds, Yaryshev Formation, in the quarry near Ozaryntsi Village, Podolia, Ukraine[2]
V. vana fossils are known from the Yorga Formation on the Zimnii Bereg (Winter Coast) of the White Sea, Arkhangelsk Region, Russia.[1] There is single reference to V. vana from the Ediacaran deposites in the South Australia, but photographies or description of these fossils were not presented.[3]
Description
The typical Vaveliksia had a frankfurter-like appearance, with one end attached to the substrate by a disk-like holdfast. The body wall was very thin, and perforated. At the top was a hole, which may be an osculum, if they were indeed true sponges. In V. velikanovi, found only in Precambrian strata of the Dneiper, the top has a crown of wrinkles which was originally interpreted as tentacles (the first fossils were originally thought to be of a polyp-like organism), and the holdfast is relatively flat and disk-like. V. vana, found at the White Sea shores and in Australia, is thinner in diameter, has an unwrinkled top, and the holdfast is much more convex or dome-like. Some specimens of V. vana also had arms.
V. velikanovi fossils range 3–8 cm in length and up to 3 cm in width. The attachment disks range 0.8–2 centimeters in diameter.[2]
V. vana range 3.5–8.6 cm in length and up to 2 cm in width. The attachment disks range 0.7–1.5 cm in diameter.[1]
See also
References
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