View source for Ivanovia

{{Short description|Extinct genus of algae}}
{{Automatic taxobox
| fossil_range = [[Pennsylvanian (geology)|Pennsylvanian]]-[[Triassic]]<br/>~{{fossil range|318|265}}
| image =
| image_caption =
| taxon = Ivanovia
| authority = Khvorova 1946
| subdivision_ranks = Species
| subdivision_ref = <ref name="fossilworks">{{cite web | url = https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=66053 | website = Fossilworks | access-date = 17 December 2021 | title = Ivanovia Khvorova 1946 (green algae) |publisher=Macquarie University | year = 2007 }}</ref><ref name="torres-1995"/><ref name="torres-2003"/>
| subdivision = ''Ivanovia permica''<br/> ''Ivanovia tebagaensis''<br/> ''Ivanovia tenuissima''<br/> ''Ivanovia triassica''
}}
'''''Ivanovia''''' is an [[extinct]] [[genus]] of [[marine (ocean)|marine]] [[green algae]] belonging to the order [[Bryopsidales]] and family [[Codiaceae]]. Species belonging to the genus lived from the [[Pennsylvanian (geology)|Pennsylvanian]] to the [[Permian]] and have been found in the Moscow basin, North America, Italy, Tunisia, and China.<ref name=fossilworks/><ref>{{cite journal |last1=Khvorova |first1=I.V. |year=1946 |title=A new genus of algae from the middle Carboniferous deposits of the Moscow Basin |journal=Comptes Rendus de l'Académie des Sciences de l'URSS |volume=23 |pages=737–739}}</ref><ref name="torres-1995">{{cite journal |jstor=1306267|title=Ivanovia tebagaensis Was a Cyathiform Permian Codiacean Membranous Alga with Dimorphic Cortices|last1=Torres|first1=Andrew M.|journal=Journal of Paleontology|year=1995|volume=69|issue=2|pages=381–387|doi=10.1017/S0022336000034703|s2cid=87160638 }}</ref><ref name="torres-2003">{{cite journal |last1=Torres |first1=Andrew M. |title=Sexual reproductive structures in the green alga Ivanovia triassica |journal=Lethaia |date=1 January 2003 |volume=36 |issue=1 |pages=33–40 |doi=10.1080/00241160310001236}}</ref>
Members of the genus have [[Thallus|thalli]] (leaflike photosynthetic structures) that are cyathiform (cuplike in shape.) There are indications that asexual reproduction took place through budding of the thalli.<ref name="torres-1995"/> Sexual reproduction also took place, through reproductive structures in stalked outgrowths of the thalli ([[oogonia]] and [[gametangia]], the female and male reproductive structures of green algae.)<ref name="torres-2003"/>
Bioherms (fossil algal mounds) constructed by ''Ivanovia'' are prominent in the [[Paradox Formation]] of the [[Colorado Plateau]], where they are important [[petroleum reservoir]]s.<ref>{{cite journal |last1=Baars |first1=D. L. |last2=Torres |first2=Andrew M. |title=Late Paleozoic Phylloid Algae: A Pragmatic Review |journal=PALAIOS |date=October 1991 |volume=6 |issue=5 |pages=513 |doi=10.2307/3514989|jstor=3514989 |bibcode=1991Palai...6..513B }}</ref><ref>{{cite book |last1=Fillmore |first1=Robert |title=Geological evolution of the Colorado Plateau of eastern Utah and western Colorado, including the San Juan River, Natural Bridges, Canyonlands, Arches, and the Book Cliffs |date=2010 |publisher=University of Utah Press |location=Salt Lake City |isbn=9781607810049 |pages=56–57}}</ref>
It is possible that ''Ivanovia'' is a [[taphotaxon]] of ''[[Anchicondium]] '' or ''[[Eugonophyllum]]''; that is, a characteristic diagenetic alteration of an original fossil organism that lacks taxonomic significance.<ref>{{cite journal |last1=Corrochano |first1=Diego |last2=Vachard |first2=Daniel |title=Remarks on the Cortical Structure of Late Paleozoic "Phylloid Algae" |journal=Journal of Paleontology |date=September 2014 |volume=88 |issue=5 |pages=1019–1030 |doi=10.1017/S0022336000057620|s2cid=232346413 }}</ref>
== References ==
{{Portal|Paleontology}}
{{Reflist}}
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[[Category:Paleozoic life]]
[[Category:Codiaceae]]
[[Category:Ulvophyceae genera]]
{{Ulvophyceae-stub}}