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.
A rimoportula is a structure through the valve of some diatoms. On the internal valve face, the rimoportula opening may have the shape of a pair of lips. On the external valve face, the rimoportula opening may be a simple, round aperture at the valve surface or it may be a tube extending out from the valve. The plural form is rimoportulae.
Rimoportulae are found in centric genera such as Stephanodiscus and Aulacoseira, in araphid genera such as Diatoma, Hannaea, Meridion and Tabellaria, and in eunotioid genera such as Actinella, Amphorotia, Eunophora, and Eunotia.
Rimoportulae extrude polysaccharides and other carbon compounds. They are considered to have appeared relatively early in diatom evolution, but to have been lost in a number of more advanced, raphid groups.
The term "jelly pore" is used in much of the older literature, including in Patrick and Reimer (1966).
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