Haptista

Haptista is a proposed group of protists made up of centrohelids and haptophytes. Phylogenomic studies indicate that Haptista, together with Ancoracysta twista, forms a sister clade to the SAR+Telonemia supergroup, but it may also be sister to the Cryptista (+Archaeplastida).^[1][2][3][4] It is thus one of the earliest diverging Diaphoretickes.

Haptista
Scientific classification
Domain:	Eukaryota
Clade:	Diaphoretickes
Phylum:	Haptista Cavalier-Smith 2015
Subphyla
Centrohelida Haptophyta

Taxonomy

Based on studies done by Cavalier-Smith, Chao & Lewis 2015^[5] and Ruggiero et al. 2015.^[6]

• Subphylum Centroheliozoa Cushman & Jarvis 1929 sensu Durrschmidt & Patterson 1987 [Heliozoa Haeckel 1862 stat. n. Margulis 1974 em. Cavalier-Smith 2003]
  • Class Centrohelea Kuhn 1926 stat. n. Cavalier-Smith 1993 [Centroplastiales; Centrohelina Hartmann 1913; Centroplasthelida Febvre-Chevalier 1984]
• Subphylum Haptophytina Cavalier-Smith 2015 (Haptophyta Hibberd 1976 sensu Ruggerio et al. 2015)
  • Clade Rappemonada Kim et al. 2011
    • Class Rappephyceae Cavalier-Smith 2015
  • Clade Haptomonada (Margulis & Schwartz 1998) [Haptophyta Hibberd 1976 emend. Edvardsen & Eikrem 2000; Prymnesiophyta Green & Jordan, 1994; Prymnesiomonada; Prymnesiida Hibberd 1976; Haptophyceae Christensen 1962 ex Silva 1980; Haptomonadida; Patelliferea Cavalier-Smith 1993]
    • Class Pavlovophyceae (Cavalier-Smith 1986) Green & Medlin 2000
    • Class Prymnesiophyceae Christensen 1962 emend. Cavalier-Smith 1996 [Haptophyceae s.s.; Prymnesiophycidae Cavalier-Smith 1986; Coccolithophyceae Casper 1972 ex Rothmaler 1951]

References

1. Burki F; Kaplan M; Tikhonenkov DV; Zlatogursky V; Minh BQ; Radaykina LV; Smirnov A; Mylnikov AP; Keeling PJ (2016), "Untangling the early diversification of eukaryotes: a phylogenomic study of the evolutionary origins of Centrohelida, Haptophyta and Cryptista.", Proc Biol Sci, 283 (1823): 20152802, doi:10.1098/rspb.2015.2802, PMC 4795036, PMID 26817772
2. Burki, F; Inagaki, Y; Bråte, J; Archibald, J.; Keeling, P.; Cavalier-Smith, T; Sakaguchi, M; Hashimoto, T; Horak, A; Kumar, S; Klaveness, D; Jakobsen, K.S; Pawlowski, J; Shalchian-Tabrizi, K (2009). "Large-scale phylogenomic analyses reveal that two enigmatic protist lineages, Telonemia and Centroheliozoa, are related to photosynthetic chromalveolates" (Free full text). Genome Biology and Evolution. 1: 231–8. doi:10.1093/gbe/evp022. PMC 2817417. PMID 20333193.
3. Schön, Max E.; Zlatogursky, Vasily V.; Singh, Rohan P.; Poirier, Camille; Wilken, Susanne; Mathur, Varsha; Strassert, Jürgen F. H.; Pinhassi, Jarone; Worden, Alexandra Z.; Keeling, Patrick J.; Ettema, Thijs J. G. (2021-11-17). "Single cell genomics reveals plastid-lacking Picozoa are close relatives of red algae". Nature Communications. 12 (1): 6651. doi:10.1038/s41467-021-26918-0. ISSN 2041-1723. PMC 8599508. PMID 34789758.
4. Strassert, Jürgen F. H.; Irisarri, Iker; Williams, Tom A.; Burki, Fabien (2021-03-25). "A molecular timescale for eukaryote evolution with implications for the origin of red algal-derived plastids". Nature Communications. 12 (1): 1879. doi:10.1038/s41467-021-22044-z. ISSN 2041-1723. PMC 7994803. PMID 33767194.
5. Cavalier-Smith; Chao; Lewis (2015), "Multiple origins of Heliozoa from flagellate ancestors: New cryptist subphylum Corbihelia, superclass Corbistoma, and monophyly of Haptista, Cryptista, Hacrobia and Chromista", Molecular Phylogenetics and Evolution, 93: 331–362, doi:10.1016/j.ympev.2015.07.004, PMID 26234272
6. Ruggiero; et al. (2015), "Higher Level Classification of All Living Organisms", PLOS ONE, 10 (4): e0119248, Bibcode:2015PLoSO..1019248R, doi:10.1371/journal.pone.0119248, PMC 4418965, PMID 25923521

External links

• Tree of Life: Hacrobia