Bigyra is a grouping of
heterokont organisms.
It includes
Bicosoecida
Bicosoecida ( ICZN) or Bicosoecales/Bicoecea (ICBN) is an order of Bikosea, a small group of unicellular flagellates, included among the heterokonts. Informally known as bicosoecids, they are a small group of unicellular flagellates. The cells ...
,
Blastocystis
''Blastocystis'' is a genus of single-celled heterokont parasites belonging to a group of organisms that are known as the Stramenopiles (also called Heterokonts) that includes algae, diatoms, and water molds. Blastocystis consists of several sp ...
and
Labyrinthulida
The Labyrinthulomycetes (ICBN) or Labyrinthulea ( ICZN) are a class of protists that produce a network of filaments or tubes, which serve as tracks for the cells to glide along and absorb nutrients for them. The two main groups are the labyrin ...
.
It has also been described as containing
Opalozoa
Opalozoa is a subphylum of heterotrophic protists of the phylum Bigyra, and is the sister group to Sagenista. Opalozoans are non-photosynthetic heterokonts that are ancestrally phagotrophic but many times have evolved to be osmotrophic saprotrop ...
,
Bicoecia
Bicosoecida (ICZN) or Bicosoecales/Bicoecea (ICBN) is an order of Bikosea, a small group of unicellular flagellates, included among the heterokonts. Informally known as bicosoecids, they are a small group of unicellular flagellates. The cells ar ...
, and
Sagenista
Sagenista is a group of heterokonts containing the labyrinthulids and Eogyrea, a class of yet uncultured protists. Originally, it contained the Labyrinthulids and bicosoecids. However at present the bicosoecids have been removed, and Eogyrea wer ...
.
Phylogeny
The cladogram below shows the internal relationships within Bigyra:
Classification
The modern taxonomy of Bigyra is as follows:
*Phylum Bigyra
**Subphylum
Opalozoa
Opalozoa is a subphylum of heterotrophic protists of the phylum Bigyra, and is the sister group to Sagenista. Opalozoans are non-photosynthetic heterokonts that are ancestrally phagotrophic but many times have evolved to be osmotrophic saprotrop ...
***Infraphylum
Placidozoa
Placidozoa is a recently defined non-photosynthetic lineage of Heterokonts.
Phylogeny
Taxonomy
Infraphylum Placidozoa Cavalier-Smith 2013
* Superclass Wobblata Cavalier-Smith 2006 stat. n. 2013 (paraphyletic)
** Class Placididea Moriya, Nakay ...
****Superclass