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I am retired and having the time of my life. My main interests are photography, astronomy, nature study and microscopy.
Elton, Pennsylvania, USA
Unfortunately, much of the additional info will be the same for most of the Epilithic Diatoms. Identifying them to the genus level isn't so bad; but taking it down to the species level is virtually impossible for the amateur; we just don't have necessary equipment. The genus Navicula, for example (not this critter), has over 1,200 species; many of which require analyzing their genomes in order to assign a species.
But I will contribute the best info that I can.
I am glad that you enjoy my images. I have been fascinated with the micro-world since I was in my early teens. I was fortunate enough to have parents that encouraged me in my scientific pursuits and bought me a microscope when I was 13-14.