Microheliella is a monotypic genus of protists containing the sole species M. maris, first described in 2012. It has a variety of unusual morphological characteristics which make its broader classification difficult. These include a centrosome with two concentric granular shells and axopodia much simpler in structure than in visually similar protists (other 'heliozoa').[1]
Recent phylogenomic analyses suggest the microhelida are sister to the Cryptista, forming a clade called Pancryptista, which would be sister to the Archaeplastida.[2][3]
CAM clade
Archaeplastida Rhodelphidia
Rhodophyta
Picozoa
Chloroplastida
Glaucophyta
Pancryptista Microheliella maris
Cryptista Palpitia
Cryptomonada
References
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^ Yabuki, A.; et al. (2012). "Microheliella maris (Microhelida ord. n.), an ultrastructurally highly distinctive new axopodial protist species and genus, and the unity of phylum Heliozoa". Protist. 163 (3): 356–388. doi:10.1016/j.protis.2011.10.001. PMID 22153838.
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^ Yazaki, Euki; Yabuki, Akinori; Imaizumi, Ayaka; Kume, Keitaro; Hashimoto, Tetsuo; Inagaki, Yuji (2021-08-31). "Phylogenomics invokes the clade housing Cryptista, Archaeplastida, and Microheliella maris": 2021.08.29.458128. doi:10.1101/2021.08.29.458128. S2CID 237393558.
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^ Euki, Yazaki; Akinori, Yabuki; Ayaka, Imaizumi; Keitaro, Kume; Tetsuo, Hashimoto; Yuji, Inagaki (2022). "The closest lineage of Archaeplastida is revealed by phylogenomics analyses that include Microheliella maris". Open Biol. 12: 210376. doi:10.1098/rsob.210376.
