Pinnularia dactylus var. dariana in DIC, labeled

DIC photomicrograph of the diatom Pinnularia dactylus var. dariana, with labels pointing to a stria, the raphe and the central nodule, and a 10 µm scale bar.

Photo from the archive of Ron Fredericks, shared under the Creative Commons Attribution 4.0 International license (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/). Credit: Ron Fredericks, BiophysicsLab.com. Test slide by Diatom Lab (diatomlab.com).