Sycidiales

Last updated

Sycidiales
Temporal range: Silurian–Carboniferous
Scientific classification OOjs UI icon edit-ltr.svg
(unranked): Viridiplantae
(unranked): Charophyta
Class: Charophyceae
Order: Sycidiales
Families

See text.

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]

Families and genera

As of February 2022, AlgaeBase accepted the following families [1] and genera. [3] [4]

Related Research Articles

<span class="mw-page-title-main">Chlorophyceae</span> Class of green algae

The Chlorophyceae are one of the classes of green algae, distinguished mainly on the basis of ultrastructural morphology. They are usually green due to the dominance of pigments chlorophyll a and chlorophyll b. The chloroplast may be discoid, plate-like, reticulate, cup-shaped, spiral- or ribbon-shaped in different species. Most of the members have one or more storage bodies called pyrenoids located in the chloroplast. Pyrenoids contain protein besides starch. Some green algae may store food in the form of oil droplets. They usually have a cell wall made up of an inner layer of cellulose and outer layer of pectose.

<span class="mw-page-title-main">Charales</span> Order of green algae in the division Charophyta

Charales is an order of freshwater green algae in the division Charophyta, class Charophyceae, commonly known as stoneworts. Depending on the treatment of the genus Nitellopsis, living (extant) species are placed into either one family (Characeae) or two. Further families are used for fossil members of the order. Linnaeus established the genus Chara in 1753.

Pseudochlorella signiensis is a species of green algae in the family Koliellaceae. Pabia signiensis, the only species in the genus Pabia, is regarded as a synonym. Pabia was sunk into Pseudochlorella in 2016.

Pleurastrum is a genus of green algae, specifically of the Chlorophyceae. As of February 2022, it was the only genus in the family Pleurastraceae.

Bracteacoccus helveticus is a species of green algae, in the family Bracteacoccaceae. Under its synonym Cryococcus helveticus, it was the only species in the genus Cryococcus.

<i>Sykidion</i> Genus of algae

Sykidion is a genus of green algae. Pseudoneochloris is a synonym of this genus. As of March 2022, Sykidion was the only genus in the family Sykidiacaeae, which was the only family in the order Sykidiales.

<i>Chlorokybus</i> Genus of basal green algae

Chlorokybus is a multicellular (sarcinoid) genus of basal green algae or charophyte. It has been classified as the sole member of the family Chlorokybaceae, which is the sole member of the order Chlorokybales, in turn the sole member of the class Chlorokybophyceae. It grows on soil and rock surfaces, and is rare.

<span class="mw-page-title-main">Coleochaetaceae</span> Order of algae

Coleochaetaceae is a family of algae. It is the only family in the Coleochaetales, an order of parenchymous charophyte algae, that includes some of the closest multicellular relatives of land plants. They questionably include the fossil genus Parka.

<span class="mw-page-title-main">Klebsormidiales</span> Order of algae

Klebsormidiales is an order of charophyte algae. It is the only order in the class Klebsormidiophyceae, sister of the Phragmoplastophyta. As of February 2022, AlgaeBase accepted two families in the order:

Trochiliscaceae is a family of fossil charophyte green algae. It is the only member of the order Trochiliscales. The reproductive structures in Trochiliscaceae 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 Trochiliscaceae are from the Devonian.

<span class="mw-page-title-main">Feistiellaceae</span> Family of algae

Feistiellaceae is a family of freshwater green algae in the order Charales.

References

  1. 1 2 Guiry, M.D.; Guiry, G.M., "Sycidiales", AlgaeBase , World-wide electronic publication, National University of Ireland, Galway, retrieved 2022-02-20
  2. 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
  3. Guiry, M.D.; Guiry, G.M., "Chovanellaceae", AlgaeBase , World-wide electronic publication, National University of Ireland, Galway, retrieved 2022-02-20
  4. Guiry, M.D.; Guiry, G.M., "Sycidiaceae", AlgaeBase , World-wide electronic publication, National University of Ireland, Galway, retrieved 2022-02-20