Editing Diatom (section)

====Adl et al., 2019 treatment====
In 2019, Adl ''et al.''<ref name="Adl 2018">{{Cite journal |last1=Adl |first1=Sina M. |last2=Bass |first2=David |last3=Lane|first3=Christopher E. |last4=Lukeš |first4=Julius |last5=Schoch |first5=Conrad L. |last6=Smirnov |first6=Alexey |last7=Agatha |first7=Sabine |last8=Berney |first8=Cedric |last9=Brown |first9=Matthew W. | display-authors = 6 | date=2018-09-26 |title=Revisions to the Classification, Nomenclature, and Diversity of Eukaryotes|journal=Journal of Eukaryotic Microbiology |volume=66 |issue=1 |pages=4–119 |doi=10.1111/jeu.12691|pmid=30257078 |pmc=6492006 }}</ref> presented the following classification of diatoms, while noting: "This revision reflects numerous advances in the phylogeny of the diatoms over the last decade. Due to our poor taxon sampling outside of the Mediophyceae and pennate diatoms, and the known and anticipated diversity of all diatoms, many clades appear at a high classification level (and the higher level classification is rather flat)." This classification treats diatoms as a phylum (Diatomeae/Bacillariophyta), accepts the class Mediophyceae of Medlin and co-workers, introduces new subphyla and classes for a number of otherwise isolated genera, and re-ranks a number of previously established taxa as subclasses, but does not list orders or families. Inferred ranks have been added for clarity (Adl. et al. do not use ranks, but the intended ones in this portion of the classification are apparent from the choice of endings used, within the system of botanical nomenclature employed).
* Clade [[Diatomista]] Derelle et al. 2016, emend. Cavalier-Smith 2017 (diatoms plus a subset of other ochrophyte groups)
** Phylum Diatomeae Dumortier 1821 [= [[Bacillariophyta]] Haeckel 1878] (diatoms)
*** Subphylum Leptocylindrophytina D.G. Mann in Adl et al. 2019
**** Class [[Leptocylindrophyceae]] D.G. Mann in Adl et al. 2019 (''[[Leptocylindrus]]'', ''[[Tenuicylindrus]]'')
**** Class [[Corethrophyceae]] D.G. Mann in Adl et al. 2019 (''[[Corethron]]'')
*** Subphylum Ellerbeckiophytina D.G. Mann in Adl et al. 2019 (''[[Ellerbeckia]]'')
*** Subphylum Probosciophytina D.G. Mann in Adl et al. 2019 (''[[Proboscia]]'')
*** Subphylum Melosirophytina D.G. Mann in Adl et al. 2019 (''[[Aulacoseira]]'', ''[[Melosira]]'', ''[[Hyalodiscus]]'', ''[[Stephanopyxis]]'', ''[[Paralia (diatom genus)|Paralia]]'', ''[[Endictya]]'')
*** Subphylum Coscinodiscophytina Medlin & Kaczmarska 2004, emend. (''[[Actinoptychus]]'', ''[[Coscinodiscus]]'', ''[[Actinocyclus]]'', ''[[Asteromphalus]]'', ''[[Aulacodiscus]]'', ''[[Stellarima]]'')
*** Subphylum Rhizosoleniophytina D.G. Mann in Adl et al. 2019 (''[[Guinardia]]'', ''[[Rhizosolenia]]'', ''[[Pseudosolenia]]'')
*** Subphylum Arachnoidiscophytina D.G. Mann in Adl et al. 2019 (''[[Arachnoidiscus]]'')
*** Subphylum Bacillariophytina Medlin & Kaczmarska 2004, emend.
**** Class [[Mediophyceae]] Jouse & Proshkina-Lavrenko in Medlin & Kaczmarska 2004
***** Subclass Chaetocerotophycidae Round & R.M. Crawford in Round et al. 1990, emend.
***** Subclass Lithodesmiophycidae Round & R.M. Crawford in Round et al. 1990, emend.
***** Subclass Thalassiosirophycidae Round & R.M. Crawford in Round et al. 1990
***** Subclass Cymatosirophycidae Round & R.M. Crawford in Round et al. 1990
***** Subclass Odontellophycidae D.G. Mann in Adl et al. 2019
***** Subclass Chrysanthemodiscophycidae D.G. Mann in Adl et al. 2019
**** Class [[Biddulphiophyceae]] D.G. Mann in Adl et al. 2019
***** Subclass Biddulphiophycidae Round and R.M. Crawford in Round et al. 1990, emend.
***** Biddulphiophyceae incertae sedis (''[[Attheya]]'')
**** Class [[Bacillariophyceae]] Haeckel 1878, emend.
***** Bacillariophyceae incertae sedis (Striatellaceae)
***** Subclass Urneidophycidae Medlin 2016
***** Subclass Fragilariophycidae Round in Round, Crawford & Mann 1990, emend.
***** Subclass Bacillariophycidae D.G. Mann in Round, Crawford & Mann 1990, emend.

See [[taxonomy of diatoms]] for more details.