Spaulding, S.,
Edlund, M.
(2008).
Nupela.
In Diatoms of North America.
Retrieved November 17, 2024, from https://diatoms.org/genera/nupela
Symmetric Biraphid
Nupela
Valves small
Areolae with external openings larger than internal openings
Central area asymmetric
Species of Nupela are small in size, generally less than 20 µm. Although the genus was first described as being isovalvar, many recently described species have been found to be heterovalvar in regard to raphe development. Heterovalvar species have one valve with a fully developed raphe and the other valve with a reduced, or absent raphe....