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.
Rapheless valve
The valve of a monoraphid pennate diatom lacking a raphe is termed the rapheless valve.
Alternative Terms
- pseudoraphe valve
The term pseudoraphe is used in much of the literature, including in Patrick and Reimer (1966).
- PRV
The abbreviation for pseudoraphe valve, PRV, is used by Kingston in Wehr and Sheath (2003).
- central sternum
The pseudoraphe is called the "central sternum" by some authors.
Citations
Image Credit: Marina Potapova
Image Credit: Marina Potapova
Image Credit: Marina Potapova
Psammothidium curtissimum is a monoraphid diatom. Here, the rapheless valve and raphe valve of a single frustule are shown together.
Image Credit: Marina Potapova
Many species of Nupela are monoraphid and are commonly confused with other genera, including Achnanthidium. The rapheless valve of N. lapidosa is shown in LM.