bacillariophyceae

{{Short description|Class of diatoms}}

{{Automatic taxobox

| taxon = Bacillariophyceae

| authority = Haeckel 1878, emend. Adl et al. 2019

}}

Bacillariophyceae is a class of diatoms.{{cite journal | url=https://doi.org/10.1111%2FJEU.12691 | doi=10.1111/JEU.12691 | title=Revisions to the Classification, Nomenclature, and Diversity of Eukaryotes | date=26 September 2018| 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. | last10=Burki | first10=Fabien | last11=Cárdenas | first11=Paco | last12=Čepička | first12=Ivan | last13=Chistyakova | first13=Lyudmila | last14=Del Campo | first14=Javier | last15=Dunthorn | first15=Micah | last16=Edvardsen | first16=Bente | last17=Eglit | first17=Yana | last18=Guillou | first18=Laure | last19=Hampl | first19=Vladimír | last20=Heiss | first20=Aaron A. | last21=Hoppenrath | first21=Mona | last22=James | first22=Timothy Y. | last23=Karnkowska | first23=Anna | last24=Karpov | first24=Sergey | last25=Kim | first25=Eunsoo | last26=Kolisko | first26=Martin | last27=Kudryavtsev | first27=Alexander | last28=Lahr | first28=Daniel J.G. | last29=Lara | first29=Enrique | last30=Le Gall | first30=Line | journal=The Journal of Eukaryotic Microbiology | volume=66 | issue=1 | pages=4–119 | pmid=30257078 | pmc=6492006}} Previously, this class was equivalent to Diatomeae, the taxonomic name for all diatoms.{{cite journal|first1=Thomas|last1=Cavalier-Smith|author-link1=Thomas Cavalier-Smith|title=Kingdom Chromista and its eight phyla: a new synthesis emphasising periplastid protein targeting, cytoskeletal and periplastid evolution, and ancient divergences|journal=Protoplasma|volume=255|pages=297–357|date=5 September 2017|doi=10.1007/s00709-017-1147-3|issue=1|pmc=5756292|pmid=28875267|doi-access=free}} However, due to both the known and estimated diversity of diatoms, since 2019 they have been expanded to several classes. In particular, Bacillariophyceae was given the following modified diagnosis:

{{blockquote|text="Chain-forming, colonial or solitary; valve outline almost always bipolar; valve pattern organized bilaterally about an elongate axial rib (sternum), as in a feather; valve structure simple or chambered; rimoportulae generally only one or two per valve or none, sometimes accompanied (or replaced?) by special slits (the ‘raphe’) involved in motility; sexual reproduction involving gametangiogamy and almost always with gametes of equal size (although sometimes with behavioural differentiation and/or morphological differences); perizonium generally differentiated into two distinct series, transverse and longitudinal; chloroplasts usually only one, two or a few and large, less often many and small."}}