Hacrobia

The coccolithophore Gephyrocapsa oceanica

The Cryptomonads-haptophytes assemblage is a monophyletic grouping^[1] of chromalveolata that are not included in the SAR supergroup.

The term "Hacrobia" has been proposed for this group.^[2] The "Ha-" refers to haptophyta, the "-cr-" refers to cryptomonads, and the "-bia" is a general suffix referring to life.

The term "Eukaryomonadae" has also been used for this group.^[3]

Members

It includes Haptophyta and Cryptophyta (including katablepharids).^[4]

In the past, heterokonts, haptophytes, and cryptomonads have been sometimes grouped together in a group known as chromist.^[5] Though the heterokonts are now split out, Cryptophyta and Haptophyta are considered to be closely related^[6] (and are sometimes simply referred to as the "Cryptophyta+Haptophyta" group.)^[7] A 2009 paper also suggests that the Telonemia and centrohelids may form a clade with the cryptophytes and haptophytes.^[8] The picobiliphytes may belong in this group but are too poorly known to be classified with confidence.^[2]

References

1. ^ Sakaguchi M, Takishita K, Matsumoto T, Hashimoto T, Inagaki Y (July 2009). "Tracing back EFL gene evolution in the cryptomonads-haptophytes assemblage: separate origins of EFL genes in haptophytes, photosynthetic cryptomonads, and goniomonads". Gene 441 (1-2): 126–31. doi:10.1016/j.gene.2008.05.010. PMID 18585873. http://linkinghub.elsevier.com/retrieve/pii/S0378-1119(08)00219-9. 
2. ^ ^{a b} Okamoto, N.; Chantangsi, C.; Horák, A.; Leander, B.; Keeling, P.; Stajich, J. E. (2009). Stajich, Jason E.. ed. "Molecular Phylogeny and Description of the Novel Katablepharid Roombia truncata gen. et sp. nov., and Establishment of the Hacrobia Taxon nov". PloS one 4 (9): e7080. Bibcode 2009PLoSO...4.7080O. doi:10.1371/journal.pone.0007080. PMC 2741603. PMID 19759916. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2741603.  edit
3. ^ "EUKARYOMONADAE". http://comenius.susqu.edu/BI/202/CHROMALVEOLATA/EUKARYOMONADAE/default.htm. Retrieved 2010-07-19. 
4. ^ Aharon Oren; R. Thane Papke (1 July 2010). Molecular Phylogeny of Microorganisms. Horizon Scientific Press. pp. 190–. ISBN 9781904455677. http://books.google.com/books?id=a5t9DYZ-wccC&pg=PA190. Retrieved 21 January 2011. 
5. ^ Csurös M, Rogozin IB, Koonin EV (May 2008). "Extremely intron-rich genes in the alveolate ancestors inferred with a flexible maximum-likelihood approach". Mol. Biol. Evol. 25 (5): 903–11. doi:10.1093/molbev/msn039. PMID 18296415. http://mbe.oxfordjournals.org/cgi/pmidlookup?view=long&pmid=18296415. 
6. ^ Rice DW, Palmer JD (2006). "An exceptional horizontal gene transfer in plastids: gene replacement by a distant bacterial paralog and evidence that haptophyte and cryptophyte plastids are sisters". BMC Biol. 4: 31. doi:10.1186/1741-7007-4-31. PMC 1570145. PMID 16956407. http://www.biomedcentral.com/1741-7007/4/31. 
7. ^ Reeb VC, Peglar MT, Yoon HS, et al. (May 2009). "Interrelationships of chromalveolates within a broadly sampled tree of photosynthetic protists". Mol. Phylogenet. Evol. 53 (1): 202–11. doi:10.1016/j.ympev.2009.04.012. PMID 19398025. http://linkinghub.elsevier.com/retrieve/pii/S1055-7903(09)00144-4. 
8. ^ 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 2009: 231–8. doi:10.1093/gbe/evp022. PMC 2817417. PMID 20333193. http://gbe.oxfordjournals.org/cgi/content/short/evp022v1?rss=1. 

External links

• Tree of Life: Hacrobia