Biddulphia

Biddulphia is a genus of diatoms.^[1][2] It is the only genus within the unranked clade Biddulphiophycidae. In 2019, Biddulphiophycidae was given the following diagnosis:^[1]

"Chain-forming (linked by mucilage pads), generally large-celled and robust; valve outline sometimes undulate; polar projections small or large and valve often with additional doming centrally and sometimes between centre and poles; pattern organized radially about a central circular annulus; pore fields ('pseudocelli') present at the poles; rimoportulae central. Biddulphia."

Biddulphia
Scientific classification
Domain:	Eukaryota
Clade:	Sar
Clade:	Stramenopiles
Phylum:	Ochrophyta
Clade:	Diatomeae
Clade:	Biddulphiophyceae
Clade:	Biddulphiophycidae Round & R.M. Crawford in Round et al. 1990, emend. Adl et al. 2019[1]
Genus:	Biddulphia