WBacillariaceae is a family of diatoms in the phylum Heterokontophyta, the only family in the order Bacillariales. Some species of genera such as Nitzchia are found in halophilic environments; for example, in the seasonally flooded Makgadikgadi Pans in Botswana.
WBiddulphiaceae is a family of diatom in the order Biddulphiales. The Biddulphiaceae are distinguished from the Eupodiscaceae by their pseudocelli, where the Eupodiscaceae have fully developed ocelli. Both families commonly inhabit the littoral zone of the ocean, close to the shore. Sixteen species of Biddulphiaceae are found on the west coast of India.
WChaetocerotaceae is a diatom family (Bacillariophyta). This family comprise the three genera Attheya T. West, Bacteriastrum Shadbolt and Chaetoceros Ehrenberg. Chaetoceros is perhaps the largest and most species rich genus of marine planktonic diatoms. The taxonomic status within Chaetocerotaceae at present is somewhat unclear.
WCoscinodiscaceae is a diatom family in the order Coscinodiscales.
WThe Cymbellaceae are a diatom family in the order Cymbellales.
WEunotiaceae is a family of diatoms in the order Eunotiales that includes the following genera:Actinella F.W. Lewis, 1864 Amphicampa (C.G. Ehrenberg) J. Ralfs in A. Pritchard, 1861 Amphorotia G.M. Williams & G. Reid, 2006 Burliganiella C.E.Wetzel & Kociolek Bicudoa C.E.Wetzel, Lange-Bertalot & L.Ector, 2012 Colliculoamphora D.M. Williams & G. Reid, 2006 † Desmogonium C.G. Ehrenberg in R. Schomburgk, 1848 Eunotia C.G. Ehrenberg, 1837 Eunotioforma J.P.Kociolek & A.L.Burliga, 2013 Euodia J.W. Bailey ex J. Ralfs in A. Pritchard, 1861 Perinotia D. Metzeltin & H. Lange-Bertalot, 2007 Semiorbis R. Patrick in R. Patrick & C.W. Reimer, 1966 Temachium Wallroth, 1833
WEupodiscaceae is a diatom family (Bacillariophyceae) present both in marine and freshwater habitats Odontella is the only genera in this family with typical marine species. However, Round et al. (1990) placed Odontella in Triceratiaceae (Schutt) Lemmermann, order Triceratiales Round and Crawford, subclass Biddulphiophycidae Round and Crawford. The taxonomic status of this family is unclear and disputed.
WNaviculaceae is a diatom family in the order Naviculales.
WSkeletonemataceae is a family of diatoms in the order Thalassiosirales. There is currently only one known genera in this family of diatoms known as Skeletonema as reported from diatom.org. Being from the thalassiosirales order means that skeletonemataceae are centric diatoms.
WSurirellaceae is a family of diatoms in the order Surirellales.
WThalassiosiraceae is a family of diatoms in the order Thalassiosirales. The family of Thalassiosiraceae have the unique quality of having a flat valve face. These diatoms are common in brackish, nearshore, and open-ocean habitats, with approximately the same number of freshwater and marine species. Thalassiosiraceae are a centric diatom full of fultoportula. These can often be mistaken for Areola. These belong to many diatom families and can be found in different forms such as the different Areolae that can be found on Navicula or Gomphoneis known as lineolate and punctate. Unlike naviculaceae who are symmetrical in shape some Thalassiosiraceae take on being tangentially undulate.