Rigifilida

Rigifilida
Scientific classification
Domain:	Eukaryota
Clade:	Opimoda
Clade:	CRuMs
Class:	Hilomonadea Cavalier-Smith 2008 emend. 2012[1]
Order:	Rigifilida Cavalier-Smith in Yabuki et al. 2012
Families
Micronucleariidae Rigifilidae

Rigifilida is a clade of non-ciliate phagotrophic eukaryotes. It consists of two genera: Micronuclearia and Rigifila.

Characteristics

Cells of rigifilids are covered with either a single or a double-layered submembrane pellicular lamina that makes them rigid in consistence. Slender branching filopodia emanate from a ventral aperture of the cell and are employed to collect bacteria upon which they feed and to attach the organism to the substratum. Around this aperture, the pellicle is reflexed around forming a peristomial collar. Other notable features are flat and irregular shaped mitocondrial cristae, a single dorsal nucleus and the lack of centrioles and cilia.^[2]

Phylogeny

Scotokaryota

Metamonada Cavalier-Smith 1987 emend. Cavalier-Smith 2003 Opimoda Ancyromonadida Cavalier-Smith 1998 emend. Atkins 2000 Malawimonadea Cavalier-Smith 2003 Amorphea Amoebozoa Lühe 1913 emend. Cavalier-Smith 1998 Obazoa Breviatea Cavalier-Smith 2004 Apusomonadida Karpov & Mylnikov 1989 Opisthokonta CRuMs[3] Mantamonadida Cavalier-Smith 2004 Rigifilida Karpov & Mylnikov 1989 Diphylleida Cavalier-Smith 1993

Taxonomy

Rigifilida is currently placed in CRuMs.^[4]

• Order Rigifilida Cavalier-Smith 2012 [Micronucleariida Cavalier-Smith 2008]
  • Family Rigifilidae Yabuki & Cavalier-Smith 2012
    • Genus Rigifila Yabuki & Cavalier-Smith 2012
      • Species Rigifila ramosa Yabuki & Cavalier-Smith 2012
  • Family Micronucleariidae Cavalier-Smith 2008
    • Genus Micronuclearia Mikrjukov & Mylnikov 2001
      • Species Micronuclearia podoventralis Mikrjukov & Mylnikov 2001

References

1. Cavalier-Smith, Thomas (2013). "Early evolution of eukaryote feeding modes, cell structural diversity, and classification of the protozoan phyla Loukozoa, Sulcozoa, and Choanozoa". European Journal of Protistology. 49 (2): 115–178. doi:10.1016/j.ejop.2012.06.001. PMID 23085100.
2. Yabuki A, Ishida KI, Cavalier-Smith T (2013). "Rigifila ramosa n. gen., n. sp., a Filose Apusozoan with a Distinctive Pellicle, is Related to Micronuclearia". Protist. 164 (1): 75–88. doi:10.1016/j.protis.2012.04.005.
3. Brown, Matthew W.; Heiss, Aaron A; Kamikawa, Ryoma; Inagaki, Yuji; Yabuki, Akinori; Tice, Alexander K.; Shiratori, Takashi; Ishida, Ken-Ichiro; Hashimoto, Tetsuo (2018-01-19). "Phylogenomics Places Orphan Protistan Lineages in a Novel Eukaryotic Super-Group". Genome Biology and Evolution. 10 (2): 427–433. doi:10.1093/gbe/evy014. ISSN 1759-6653. PMC 5793813. PMID 29360967.
4. Adl, Sina M.; Bass, David; Lane, Christopher E.; Lukeš, Julius; Schoch, Conrad L.; Smirnov, Alexey; Agatha, Sabine; Berney, Cedric; Brown, Matthew W. (2018-09-26). "Revisions to the Classification, Nomenclature, and Diversity of Eukaryotes". Journal of Eukaryotic Microbiology. 66 (1): 4–119. doi:10.1111/jeu.12691. ISSN 1066-5234. PMC 6492006. PMID 30257078.