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Dinophyceae



Dinophyceae

"Peridinea" from Ernst Haeckel's Kunstformen der Natur, 1904
Scientific classification
Domain: Eukaryota
Kingdom: Chromalveolata
Superphylum: Alveolata
Phylum: Dinoflagellata
Class: Dinophyceae
Pascher, 1914 em.

The Dinophyceae are the main class of dinoflagellates. They include all species where the nucleus remains a dinokaryon throughout the entire cell cycle, which is typically dominated by the haploid stage. All the "typical" dinoflagellates, such as Peridinium and Gymnodinium, belong here. Others are more unusual, including some that are colonial, amoeboid, or parasitic.

Additional recommended knowledge

Dinoflagellates are classified by morphology. Species with a theca are divided into four orders, based on the arrangement of the armor plates:

  • Peridiniales - e.g. Peridinium
  • Gonyaulacales - e.g. Ceratium, Gonyaulax
  • Dinophysiales - e.g. Dinophysis
  • Prorocentrales - e.g. Prorocentrum

The Peridiniales are probably paraphyletic to the others, and on rRNA trees they are mixed with the species that lack thecae. The other three orders are probably monophyletic, with the Dinophysiales and Prorocentrales as close relatives, united by the presence of a sagittal suture dividing the theca in two. However, on rRNA trees the Prorocentrales are split up.

The groups of dinoflagellates without theca are understood to be artificial, and are mostly polyphyletic. Many of the genera, such as Gymnodinium and Amphidinium, are also polyphyletic. However some may approximate monophyletic groups, such as the Suessiales, and some have not been studied phylogenetically.

  • Gymnodiniales - e.g. Gymnodinium, Amphidinium
  • Ptychodiscales
  • Suessiales - e.g. Symbiodinium
  • Desmocapsales
  • Phytodiniales - e.g. Dinamoeba, Pfiesteria (includes Dinococcales, Dinotrichales)
  • Thoracosphaerales

There is also a group of parasitic dinoflagellates, the Blastodiniales, that do not have dinokarya during their trophic stage. Because of this, they have been treated as a separate class Blastodiniphyceae, but some or all may actually have developed within the Dinophyceae.

References

  • JF Saldarriaga et al. (2001). Dinoflagellate Nuclear SSU rRNA Phylogeny Suggests Multiple Plastid Losses and Replacements. Journal of Molecular Evolution 53: 204-213.
  • F. J. R. "Max" Taylor (2004). Illumination or confusion? Dinoflagellate molecular phylogenetic data viewed from a primarily morphological standpoint. Phycological Research 52: 308-324.
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Dinophyceae". A list of authors is available in Wikipedia.
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