{{Short description|Genus of proarticulate}} {{italic title}} {{Speciesbox | fossil_range = late Ediacaran<br> ~{{fossil range|553}} | image = Ivovicia sketch.png | image_caption = Life restoration of ''Ivovicia rugulosa'' | display_parents = | genus = Ivovicia | parent_authority = Ivantsov, 2007 | species = rugulosa | authority = 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.<ref name="Ivantsov2007">{{cite journal |author=Ivantsov, A. Yu. |title=Small Vendian transversely Articulated fossils |journal=Paleontological Journal |volume=41 |issue=2 |date=April 2007 |doi=10.1134/S0031030107020013 |url=https://www.academia.edu/2352394 |pages=113–122 |s2cid=86636748}}</ref>
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.<ref name="Ivantsov2007"/>
== Description == ''Ivovicia rugulosa'' is an oval-shaped organism, getting up to {{cvt|18.8|mm|1}} in length and {{cvt|12.6|m|1}} 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.<ref name="Ivantsov2007"/>
== 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''.<ref name="Ivantsov2007"/> 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.<ref name="Ivantsov2007"/> As with most other Ediacaran organisms, ''Ivovicia'' was assigned to the proposed clade of Vendobionta.<ref>{{cite journal |last1=Sokolov |first1=B. S. |title=Precambrian paleontology and acrochrons of the biosphere evolution: On the theory of the expanding biosphere |journal=Stratigraphy and Geological Correlation |date=April 2012 |volume=20 |issue=2 |pages=115–124 |doi=10.1134/S0869593812020074 |issn=0869-5938 |eissn=1555-6263}}</ref>
''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.<ref name=Ivantsov_2019>{{cite journal |first1=A.Y. |last1=Ivantsov |first2=M.A. |last2=Fedonkin |first3=A.L. |last3=Nagovitsyn |first4=M.A. |last4=Zakrevskaya |year=2019 |title=''Cephalonega'', a new generic name, and the system of Vendian Proarticulata |journal=Paleontological Journal |volume=53 |issue=5 |pages=447–454 |doi=10.1134/S0031030119050046 |s2cid=203853224 |url=https://www.researchgate.net/publication/335988735 }}</ref>
==References== {{Reflist}}
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{{portal|Paleontology}}
Category:Proarticulata Category:Ediacaran life Category:Monotypic proarticulatan genera