Coscinodiscophyceae

Diatoms

Marine diatoms
Scientific classification
Domain:	Eukaryota
Kingdom:	Chromalveolata
Phylum:	Heterokontophyta
Class:	Bacillariophyceae
Order:	Coscinodiscophyceae
Suborders
Biddulphiophycidae Chaetocerotophycidae Corethrophycidae Coscinodiscophycidae Cymatosirophycidae Lithodesmiophycidae Rhizosoleniophycidae Thalassiosirophycidae

Coscinodiscophyceae is a class of diatom.^[1]

Coscinodiscophyceae is similar to Centrales. Order Centrales is a traditional, paraphyletic subdivision of the heterokont algae known as diatoms.^[2]^[3]^[4] The order is named for the shape of the cell walls (or valves or frustules) of centric diatoms, which are circular or ellipsoid in valve view. The valves often bear radially symmetrical ornamental patterns that can appear as dots when viewed with an optical microscope. Some also bear spines on their valves, which may either increase cell surface area and reduce sinking, or act as a deterrent to zooplankton grazers. Unlike pennate diatoms, centric diatoms never have a raphe.

In terms of cell cycle, vegetative cells are diploid and undergo mitosis during normal cell division. In sexual species, oogamous meiosis produces haploid gametes, either ova or sperm cells. These fuse to produce a zygote which expands in size to develop into an auxospore from which full-size vegetative cells are produced.

In some taxonomy schemes,^[3] the centric diatoms are known instead as Order Coscinodiscophyceae. And in some schemes as order Biddulphiales.^[5] However, diatom taxonomy is changing due to the development of new molecular and genetical analysis tools.^[4]

See also 1
References 2
Further Reading 3
External links 4

References

^ Cattolico RA, Jacobs MA, Zhou Y; et al. (2008). "Chloroplast genome sequencing analysis of Heterosigma akashiwo CCMP452 (West Atlantic) and NIES293 (West Pacific) strains". BMC Genomics 9: 211.
^ Hoek, C. van den, Mann, D. G. and Jahns, H. M. (1995). Algae : An introduction to phycology, Cambridge University Press, UK.
^ ^a ^b Round, F. E. and Crawford, R. M. (1990). The Diatoms. Biology and Morphology of the Genera, Cambridge University Press, UK.
^ ^a ^b Williams, D. M., Kociolek, J. P., (2007). Pursuit of a natural classification of diatoms: History, monophyly and the rejection of paraphyletic taxa, European Journal of Phycology, 42:3, 313-319.
^ Tomas, C. R., Hasle G. R., Syvertsen, E. E., Steidinger, K. A., Tangen, K., Throndsen, J., Heimdal, B. R., (1997). Identifying Marine Phytoplankton, Academic Press.

External links

Auxospore Axodine Chaetoceros Chaetocerotaceae Coccolithophore Emiliania huxleyi Eustigmatophyte Frustule Heterokont Nannochloropsis Navicula Prasinophyceae Raphidophyte Thalassiosira pseudonana

Diatom orders	Centrales Pennales (Classes: Coscinodiscophyceae Fragilariophyceae Bacillariophyceae)

Flagellates

Zooplankton

Chaetognatha Ciguatera Ctenophora Gelatinous zooplankton Hunting copepods Ichthyoplankton Jellyfish Marine larvae Crustacean larvae Salmon louse Sea louse

Copepod orders	Calanoida Cyclopoida Harpacticoida Monstrilloida Poecilostomatoida Siphonostomatoida More...

Domain
(Kingdom: )

Ochrophyta
(photosynthetic)

Phaeista

Hypogyristea

Chrysista

Chrysophyceae, golden algae	Chromulinales Chrysosphaerales Hibberdiales Hydrurales Phaeothamniales

Eustigmatophyceae	Eustigmataceae Monodopsidaceae Pseudocharaciopsidaceae

Phaeophyceae, brown algae	Ascoseirales Cutleriales Desmarestiales Dictyotales Discosporangiales Ectocarpales Fucales Ishigeales Laminariales Nemodermatales Onslowiales Ralfsiales Scytosiphonales Scytothamnales Sphacelariales Sporochnales Syringodermatales Tilopteridales

Phaeothamniophyceae	Phaeothamniales Pleurochloridellales

Raphidophyceae	Chattonella, Fibrocapsa, Gonyostomum, Haramonas, Heterosigma, Vacuolaria

Synurophyceae	Heterogloeales Ochromonadales Rhizochloridales Synurales

Xanthophyceae, yellow-green algae	Botrydiales Mischococcales Tribonematales Vaucheriales

Khakista

Bolidophyceae

Bolidomonas

Bacillariophyta,
diatoms

Coscinodiscophyceae	Biddulphiophycidae Chaetocerotophycidae Corethrophycidae Coscinodiscophycidae Cymatosirophycidae Lithodesmiophycidae Rhizosoleniophycidae Thalassiosirophycidae

Bacillariophyceae	Bacillariales Naviculales

Fragilariophyceae	Fragilariales

Heterotrophic
groups

Pseudofungi

Bigyra

Sagenista	Bicosoecea Labyrinthulomycetes

Opalinata/Slopalinida	Opalinidae Proteromonadidae Blastocystis

Categories

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Coscinodiscophyceae