Postgaardia

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Postgaardia
Scientific classification Edit this classification
Domain: Eukaryota
Phylum: Euglenozoa
Subphylum: Postgaardia
Cavalier-Smith, 2016[1]
Synonyms
  • Symbiontida Yubuki, Edgcomb, Bernhard and Leander, 2009

Postgaardia is a proposed basal clade of flagellate Euglenozoa, following Thomas Cavalier-Smith.[2] As of April 2023, the Interim Register of Marine and Nonmarine Genera treats the group as a subphylum.[1] A 2021 review of Euglenozoa places Cavalier-Smith's proposed members of Postgaardia in the class Symbiontida.[3] As Euglenozoans may be basal eukaryotes, the Postgaardia may be key to studying the evolution of Eukaryotes, including the incorporation of eukaryotic traits such as the incorporation of alphaproteobacterial mitochondrial endosymbionts.

Euglenozoa are a large group of

Symbiontida. Euglenozoa are unicellular, mostly around 15–40 μm (0.00059–0.00157 in) in size, although some euglenids get up to 500 μm (0.020 in) long.[4]

Characteristics

Euglenozoa are characterized by the ultrastructure of the

diplonemids and Postgaardi.[5]

Postgaardea is a third deep-branching euglenozoan clade that may be a sister to Euglenoida but does not branch within them or Glycomonada on the evolutionary most realistic sequence trees presented in the next three sections, contrary to some poorly resolved earlier trees. They were placed in the new subphylum Postgaardia because they are radically different ultrastructurally from both euglenoids and glycomonads.[2]

Postgaardia are

cytopharynx is simplified. Postgaardea is the lone included class in etymology.[2]

Reconstructions of FA ultrastructure in Postgaardi and Calkinsia confirmed that they were fundamentally similar and deserved to be classified together as a distinct order Postgaardida and class Postgaardea , as both genera share six finger-like projections.[2]

Taxonomy

Cavalier-Smith (2017)[6]

    • Infraphylum Postgaardia Cavalier-Smith 2016 stat. nov. Cavalier-Smith 2017
      • Class
        Postgaardea
         Cavalier-Smith 1998 s.s. [Symbiontida Yubuki et al., 2009]
        • Order Bihospitida Cavalier-Smith 2016
        • Order
          Postgaardida
          Cavalier-Smith 2003
          • Family
            Calkinsiidae
            Cavalier-Smith 2016
          • Family
            Postgaardidae
            Cavalier-Smith 2016

References

  1. ^ a b Postgaardia . Retrieved through: Interim Register of Marine and Nonmarine Genera.
  2. ^
    PMID 27889663
    .
  3. PMID 33715388
    .
  4. ^ "Euglenozoa". Encyclopedia of Life. National Museum of Natural History - Smithsonian Institution. Retrieved 16 January 2020.
  5. doi:10.1016/s0003-9365(97)80012-7
    .
  6. PMID 29073503
    .

External links