Cyanorus

{{Short description|Genus of Precambrian organisms}}

{{Speciesbox

| fossil_range = Ediacaran, around {{Fossil range|555}}

| image = Cyanorus singularis.jpg

| image_alt =

| image_caption = Restoration of C. singularis

| genus = Cyanorus

| parent_authority = Ivanstov, 2004

| species = singularis

| authority = Ivanstov, 2004{{cite web|url=http://taxonomicon.taxonomy.nl/TaxonTree.aspx?src=0&id=1674895|title=Species †Cyanorus singularis - Hierarchy - The Taxonomicon|website=taxonomicon.taxonomy.nl|access-date=15 December 2018}}

| synonyms =

| synonyms_ref =

}}

Cyanorus singularis{{efn|The genus name is derived from the Greek,κυανεος ορος, which means Blue Mountain, in honor of the name of the area of the same name, where the fossils were found.}} is a small proarticulatan, closely related to Spriggina and Marywadea.{{Cite journal|last=Ivantsov|first=A. Yu.|date=2004|title=New Proarticulata from the Vendian of the Arkhangel'sk Region|journal=Paleontological Journal|volume=38|issue=3|pages=247|citeseerx=10.1.1.738.7043}} The anterior part of the body was most likely not segmented. The axial structure of it combines features of the Vendia species and Dickinsonia species. It was found in the Upper Vendian of the White Sea area, Arkhangel'sk Region. It is a White Sea Ediacaran fossil and it became extinct during the Late Precambrian.

Like other animals from the phylum Proarticulata, the symmetry observed is not exactly bilaterian{{cite journal | author = McCall, GJH | year = 2006 | doi = 10.1016/j.earscirev.2005.08.004 | title = The Vendian (Ediacaran) in the geological record: Enigmas in geology's prelude to the Cambrian Explosion | journal = Earth-Science Reviews | volume = 77 | issue = 1–3 | pages = 1–229 | bibcode = 2006ESRv...77....1M }} but appears to be a glide reflection, where opposite segments are shifted by half an interval.{{cite journal | author = Ivantsov, Andrey | year = 2001 | title = Vendian and Other Precambrian "Arthropods" | journal = Paleontological Journal | volume = 35 | pages = 335–343 | url = https://www.researchgate.net/publication/291816373}} {{cite journal | author = Ivantsov, Andrey | year = 2011 | doi = 10.1134/S0031030111030063 | title = Feeding traces of proarticulata-the Vendian Metazoa | journal = Paleontological Journal | volume = 45 | issue = 3 | pages = 237–248 | url = https://www.researchgate.net/publication/226404182_Feeding_traces_of_proarticulata-the_Vendian_Metazoa }} {{cite thesis |last= Ivantsov |first= Andrey |date= December 2023 |title= Abstract of the thesis paleobiology of Proarticulata and the problem of the rise of Bilateria | journal = Russian Academy of Sciences |url= https://www.researchgate.net/publication/377782046_ABSTRACT_OF_THE_THESIS_PALEOBIOLOGY_OF_PROARTICULATA_AND_THE_PROBLEM_OF_THE_RISE_OF_BILATERIA |degree= |chapter= |publisher= |docket= |oclc= |access-date= 4 Dec 2024}}