(Reimer) Potapova 2013 Category: Symmetrical biraphid
BASIONYM: Achnanthes decipiens Reimer 1966
Contributor: Marina Potapova - February 2013
Length Range: 10-24 µm
Width Range: 4.2-6.6 µm
Striae in 10 µm: 32-45
Frustules heterovalvar: one valve lacks the raphe. Valves lanceolate with acute apices. The axial area on raphe valve widens into a broad, transversely rhomboid or diamond-shaped central area. The striae on raphe valve are very fine, but can be resolved under LM. The rapheless valve usually appears almost structurless under LM because striae are too fine to be resolved. The striae on rapheless valve vary in length: in some valves they are short and a wide axial area is present. This axial area bears irregular depressions on the external valve surface. On other valves the sUnder LM the rapheless valve usually appears almost structurless.triae appear to be longer so that axial area is almost absent, but these striae are formed not by areolae, but by small transapically elongated depressions on the external valve surface.
Basionym: Achnanthes decipiens
Author: Reimer 1966
Length Range: 10-28 µm
Width Range: 5.5-7.5 µm
Striae in 10 µm: 28-31 raphe valve, 33-35 rapheless valve
Reimer, C.W. (1966). Consideration of fifteen diatom taxa (Bacillariophyta) from the Savannah River, including seven described as new. Notulae Naturae (Academy of Natural Sciences of Philadelphia) 397:1-15.
Nupela decipiens is known from the Eastern United States.