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Fawley, Marvin W.; Yun, Yue; Qin, Mingbo. (2000) "Phylogenetic analyses of 18S rDNA sequences reveal a new coccoid lineage of the Prasinophyceae (Chlorophyta)." Journal of Phycology 36(2):387–393.
The relative abundance of five cell types was determined: uniflagellate, biflagellate, green coccoid (wrinkled cell wall in SEM), blue-green coccoid (smooth cell wall in SEM), and miscellaneous coccoids. Booth, B. C. (1988) "Size classes and major taxonomic groups of phytoplankton at two locations in the subarctic Pacific Ocean in May and August, 1984". Marine Biology 97(2):275–286.
The quantitative data are not representative for 'naked' phytoflagellates and coccoids, and can indicate the correct order of magnitude for diatoms, thecate dinoflagellates and coccolithophorids only. Heimdal, Berit Riddervold. (1983) "Phytoplankton and nutrients in the waters north-west of Spitsbergen in the autumn of 1979". Journal of plankton research 5(6):901–918.
Two morphological types of coccoids were observed, one of which was electron-dense and had an intact cellular membrane and flagella, indicating that it was likely to be viable. Zheng, P. Y.; Hua, J.; Ng, H. C.; Ho, B. (1998) "Unchanged characteristics of Helicobacter pylori during its morphological conversion". Microbios 98(389):51–64.
Gullan, P. J. and Cockburn, A. (1986) "Sexual dichronism and intersexual phoresy in gall-forming coccoids". Oecologia 68:632–634.
Pringle, E. G.; Dirzo, R.; Gordon, D. M. (2011) "Indirect benefits of symbiotic coccoids for an ant-defended myrmecophytic tree" Ecology 92(1):37–46.
Haig, David (1993). "The evolution of unusual chromosomal systems in coccoids: extraordinary sex ratios revisited". Journal of evolutionary biology 6(1):69–77.
