Sycidiales
Extinct order of algae
From Wikipedia, the free encyclopedia
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: | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Clade: | Archaeplastida |
| Clade: | Viridiplantae |
| Division: | Charophyta |
| Class: | Charophyceae |
| Order: | †Sycidiales |
| Families | |
|
See text. | |
Families and genera
As 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
