Ivovicia
| Ivovicia Temporal range: late Ediacaran
~ | |
|---|---|
| Life restoration of Ivovicia rugulosa | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | †Proarticulata |
| Class: | †Cephalozoa |
| Family: | †Yorgiidae |
| Genus: | †Ivovicia Ivantsov, 2007 |
| Species: | †I. rugulosa
|
| Binomial name | |
| †Ivovicia rugulosa Ivantsov, 2007
| |
Ivovicia is an extinct genus of yorgiid proarticulate from the late Ediacaran of Russia. It is a monotypic genus, containing only Ivovicia rugulosa.
Discovery and naming
The holotype fossil material of Ivovicia was found in the Zimmii Bereg of the Zimniegory Subformation in the Ustʹ Pinega Formation, Arkhangelsk Region, Russia in 2002 and 2005, and was formally described and named in 2007.[1]
The generic name Ivovicia derives from the place name of Ivovik Creek, which is near to the type locality that the fossils were found in. The specific name rugulosa derives from the Latin word rugulosus, to mean "finely wrinkled", in reference to the overall appearance of the organism.[1]
Description
Ivovicia rugulosa is an oval-shaped organism, getting up to 18.8 mm (0.7 in) in length and 12.6 m (41.3 ft) at its widest. It is composed of a wide, but short, undivided "head" region, and a long body of notably thin isomers. The isomers are, as with all proarticulates, offset from one another in what is known as glided symmetry, forming a zig-zag shaped midline. On either side of this midline, it has been noted there are two prominent bands from the back of the "head" to the posterior of the body.[1]
Affinities
Ivovicia is noted to combine certain features from other proarticulates, like Dickinsonia, Andiva and Marywadea, with it being mentioned that Ivovicia could represent junior specimens of Dickinsonia or Andiva due to said shared features. Although, other certain features in these two other genera make this not possible, as no Dickinsonia species bear a notable "head" region, whilst the smallest Andiva specimen is already quite different from the largest specimen of Ivovicia.[1] Meanwhile the similarities with Marywadea, a sprigginid only known from Australia, suggests that yorgiids like Ivovicia may represent a transitional family between the simpler dickinsoniids, and the more complex sprigginids.[1] As with most other Ediacaran organisms, Ivovicia was assigned to the proposed clade of Vendobionta.[2]
Ivovicia would later be brought under the Cephalozoa class, due to the family its in, the Yorgiidae, being brought under said class alongside the Sprigginidae family, due to the aforementioned similarities between the two.[3]
References
- ^ a b c d e Ivantsov, A. Yu. (April 2007). "Small Vendian transversely Articulated fossils". Paleontological Journal. 41 (2): 113–122. doi:10.1134/S0031030107020013. S2CID 86636748.
- ^ Sokolov, B. S. (April 2012). "Precambrian paleontology and acrochrons of the biosphere evolution: On the theory of the expanding biosphere". Stratigraphy and Geological Correlation. 20 (2): 115–124. doi:10.1134/S0869593812020074. eISSN 1555-6263. ISSN 0869-5938.
- ^ Ivantsov, A.Y.; Fedonkin, M.A.; Nagovitsyn, A.L.; Zakrevskaya, M.A. (2019). "Cephalonega, a new generic name, and the system of Vendian Proarticulata". Paleontological Journal. 53 (5): 447–454. doi:10.1134/S0031030119050046. S2CID 203853224.