Sullivan, M.,
Lobban, C.,
Ashworth, M.,
Frankovich, T.
(2024).
Petroneis.
In Diatoms of North America.
Retrieved November 21, 2024, from https://diatoms.org/genera/petroneis
Symmetric Biraphid
Petroneis
Areolae coarse, punctate
Internal proximal raphe ends hooked (SEM)
Internal pore occlusions volate (SEM)
This taxon is found in sandy sediments of temperate to tropical marine waters. Cells are solitary, rectangular in girdle view, isovalvar, and heavily silicified. The valve outline is broadly linear to elliptic with either weakly drawn out, obtusely rounded, or rostrate apices. The valve face is flat, very gently curving at the valve...