Oestrupia Heiden ex Hustedt
Frustules biraphid, symmetrical to the apical and transapical axes, raphe median and striae costa-like. Striae interrupted by apically-oriented ribs running the length of the valve.
Oestrupia resembles Pinnularia, but differs by having apically-oriented ribs. Rare.
Light Microscope Image(s)
Each image is accompanied by the genus and species, California Academy of Sciences slide number (ie. CAS 612010), location of the specimen on the slide, and dimension in microns.