Cox (in Frey 2015) has recently proposed “Ulnariaceae nom. prov.” (typus: Ulnaria), which gathers diatom genera of the Order Licmophorales with linear frustules, rimoportula(e), apical pore fields and (commonly) marine, periphytic life forms.
Frey W. (2015) Syllabus of Plant Families - A. Engler’s Syllabus Der Pflanzenfamilien Part 2/1: Photoautotrophic Eukaryotic Algae: Glaucocystophyta Cryptophyta Dinophyta/ Dinozoa Haptophyta Heterokontophyta/ Ochrophyta Chlorarachniophyta/ Cercozoa Euglenophyta/ Euglenozoa Chlorophyta Streptophyta P.P. Gebruder Borntraeger Verlagsbuchhandlung Science Publishers Berlin 324 pp