Coleochaetophyceae

Coleochaetophyceae
Coleochaete sp.
Scientific classification
Domain: Eukaryota
Clade: Archaeplastida
Clade: Viridiplantae
Division: Charophyta
Class: Coleochaetophyceae
C.Jeffrey[1]
Orders

Coleochaetophyceae is a class of charophyte algae related to land plants (only Zygnematophyceae is closer), and is estimate to be 606.1 ± 119.4 million years old.[2][3] There are about 35 known species, and are predominantly found in freshwater where they live periphytic on the surface of aquatic plants, plastic bags and pebbles in the shallow littoral zone of freshwater lakes.[4][5] These are small disc-shaped or filamentous species – the filaments can be spread radially or be irregularly branched – but can reach several millimeters in diameter,[3][6] and have true multicellular organisation with sexual and asexual reproduction. The discs never develop beyond a two-dimensional organization.[7] Their mitogenome is the most intron rich organelle among the streptophyte algae.[8] The sperm cells are flagellated, but the egg has no flagella,[9] and the following zygote pssesses algaenan, which sporopollenin.[10]

The group contain two orders, Coleochaetales and Chaetosphaeridiales.[1]

References

  1. ^ a b Guiry, M.D.; Guiry, G.M. "Coleochaetophyceae". AlgaeBase. University of Galway.
  2. ^ Donoghue, P.; Paps, J. (2020). "Plant Evolution: Assembling Land Plants". Current Biology. 30 (2): R81–R83. Bibcode:2020CBio...30..R81D. doi:10.1016/j.cub.2019.11.084. PMID 31962083.
  3. ^ a b Phylogenomics unveil a recent origin of morphological complexity in Coleochaetophyceae
  4. ^ Biology of Algae, Lichens and Bryophytes
  5. ^ Transitions between marine and freshwater environments provide new clues about the origins of multicellular plants and algae
  6. ^ Coordination of plant cell division and expansion in a simple morphogenetic system
  7. ^ Three-dimensional growth: a developmental innovation that facilitated plant terrestrialization
  8. ^ Monique Turmel, Christian Otis & Claude Lemieux (2019) Complete mitogenome of the streptophyte green alga Coleochaete scutata (Coleochaetophyceae), Mitochondrial DNA Part B, 4:2, 4209-4210
  9. ^ Let's talk about sex: Why reproductive systems matter for understanding algae
  10. ^ Phylogeny and evolution of streptophyte algae
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