The valve face undulates and the raphe is in a keel around the margin.
Sampled form what I think is the GlenEcho creek in Oak Glen Park.
Images taken with Bio-Rad ZOE fluorescent imager
Both images 100x magnification. I think asymmetrical biraphid. https://westerndiatoms.colorado.edu/taxa
Diatom
Found along stoney shoreline of man-made lake.
Temp: 80F 26.7C
pH 8
Diatom
Found along marshy shoreline of man-made lake.
Temp: 80F 26.7C
pH 7.3
Elongated, green color inside the body with particular cell arrangement inside the membrane. Found in pond water
Found in a puddle of standing water at my friends home.