Sycidiales is an order of fossil charophyte green algae.[1] The reproductive structures in Sycidales (and Trochiliscaceae, placed in Trochiliscales by AlgaeBase) have a calcified cover, called a utricle, that is thought to prevent the zygote being desiccated. Other Paleozoic families lack this cover, as do modern charophytes. Fossils of the family Sycidiaceae are found over the longest time span, from the Silurian to the Carboniferous.[2]
| Sycidiales Temporal range:
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|---|---|
Scientific classification 
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| Clade: | Viridiplantae |
| (unranked): | Charophyta |
| Class: | Charophyceae |
| Order: | †Sycidiales |
| Families | |
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See text. | |
Families and genera
editAs of February 2022[update], AlgaeBase accepted the following families[1] and genera.[3][4]
- †Chovanellaceae
- †Chovanella Reitlinger & Yartseva – 1 species
- †Sycidiaceae Karpinsky
- †Calcisphaera Williamson – 4 species
- †Gemmichara Zhen Wang – 1 species
- †Maslovella Samojlova – 1 species
- †Sycidium G.Sandberger – 12 species
References
edit- ^ a b Guiry, M.D.; Guiry, G.M., "Sycidiales", AlgaeBase, World-wide electronic publication, National University of Ireland, Galway, retrieved 2022-02-20
- ^ Taylor, T.N.; Taylor, E.L. & Krings, M. (2009), Paleobotany, The Biology and Evolution of Fossil Plants (2nd ed.), Amsterdam; Boston: Academic Press, pp. 136–137, ISBN 978-0-12-373972-8
- ^ Guiry, M.D.; Guiry, G.M., "Chovanellaceae", AlgaeBase, World-wide electronic publication, National University of Ireland, Galway, retrieved 2022-02-20
- ^ Guiry, M.D.; Guiry, G.M., "Sycidiaceae", AlgaeBase, World-wide electronic publication, National University of Ireland, Galway, retrieved 2022-02-20
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