# Sycidiales

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> Source: https://en.wikipedia.org/wiki/Sycidiales
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{{Short description|Extinct order of algae}}
{{Automatic taxobox
|fossil_range={{Geological range|Silurian|Carboniferous}}
|taxon = Sycidiales
|subdivision_ranks = Families
|subdivision = See text.
}}
'''Sycidiales''' is an order of fossil [charophyte](/source/Charophyta) [green algae](/source/green_algae).<ref name=AB_t179954>{{AlgaeBase taxon |mode=cs2 |name=Sycidiales |id=179954 |access-date=2022-02-20}}</ref> The reproductive structures in Sycidales have a calcified cover, called a ''utricle'', that is thought to prevent the [zygote](/source/zygote) being desiccated. Other [Paleozoic](/source/Paleozoic) families lack this cover, as do modern charophytes. Fossils of the family [Sycidiaceae](/source/Sycidiaceae) are found over the longest time span, from the [Silurian](/source/Silurian) to the [Carboniferous](/source/Carboniferous).<ref name=TaylTaylKrin09>{{Citation |last1=Taylor |first1=T.N. |last2=Taylor |first2=E.L. |last3=Krings |first3=M. |year=2009 |title=Paleobotany, The Biology and Evolution of Fossil Plants |edition=2nd |publication-place=Amsterdam; Boston |publisher=Academic Press |isbn=978-0-12-373972-8 |name-list-style=amp |pages=136–137 }}</ref> 

==Families and genera==
{{As of|2022|February}}, AlgaeBase accepted the following families<ref name=AB_t179954/> and genera.<ref>{{AlgaeBase taxon |mode=cs2 |name=Chovanellaceae |id=179956 |access-date=2022-02-20}}</ref><ref>{{AlgaeBase taxon |mode=cs2 |name=Sycidiaceae |id=179957 |access-date=2022-02-20}}</ref>
*†[Chovanellaceae](/source/Chovanellaceae)
**†''[Chovanella](/source/Chovanella)'' <small>Reitlinger & Yartseva</small> – 1 species
*†[Sycidiaceae](/source/Sycidiaceae) <small>Karpinsky</small>
**†''[Calcisphaera](/source/Calcisphaera)'' <small>Williamson</small> – 4 species
**†''[Gemmichara](/source/Gemmichara)'' <small>Zhen Wang</small> – 1 species
**†''[Maslovella](/source/Maslovella)'' <small>Samojlova</small> – 1 species
**†''[Sycidium](/source/Sycidium_(alga))'' <small>G.Sandberger</small> – 12 species

==References==
{{Reflist}}

{{taxonbar|from1=Q35137047}}

Category:Charophyta
Category:Charophyta orders
{{Green alga-stub}}

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Adapted from the Wikipedia article [Sycidiales](https://en.wikipedia.org/wiki/Sycidiales) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Sycidiales?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.