Glossary
Like the rest of this website, the glossary is a work in progress. If we’ve missed a term, please contact us to let us know the term and references.
Longitudinal rib
A longitudinal rib is a solid silica structure that runs along each side of the raphe in genera such as Frustulia.
Image Credit: Carrie Graef
Image Credit: Sarah Spaulding
Image Credit: Carrie Graef
In Frustulia, the raphe lies between the two branches of the longitudinal rib.
Image Credit: Sarah Spaulding
Species in Playaensis possess a longitudinal rib on either side of the raphe.