Fragilariophyceae is a group of

pennate diatom The order Pennales is a traditional subdivision of the heterokont algae known as diatoms. The order is named for the shape of the cell walls (or valves or frustules) of pennate diatoms, which are elongated in valve view. The valves may be lin ...

s lacking a raphe.

Examples

It includes the following genera:

Fragilariales

*'' Ardissonea'' *'' Asterionella'' *'' Asterionellopsis'' *'' Catacombas'' *'' Diatoma'' *'' Fragilaria'' *'' Fragilariforma'' *'' Grammonema'' *'' Hyalosynedra'' *'' Neofragilaria'' *'' Opephora'' *'' Pseudostaurosira'' *'' Punctastriata'' *'' Staurosira'' *'' Staurosirella'' *'' Synedra'' *'' Synedropsis'' *'' Tabularia'' *'' Ulnaria''

Striatellales

*'' Hyalosira'' *'' Striatella'' *'' Toxarium''

Other

*'' Climacosphenia'' *'' Cyclophora'' *'' Delphineis'' *'' Protoraphis'' *'' Rhabdonema'' *'' Rhaphoneis'' *'' Tabellaria'' *'' Thalassionema''

References

Heterokont classes {{Diatom-stub