Image 1
Image 2
Look at those two images. Now imagine they fossilised. Do you think you'd be claiming they're 'practically identical'? Almost indistinguishable?
I would.
Here's the thing: the first image is of Bacteria, the second of Archaea. Genetically and biochemically the second one is as close to you and I as it is to the first one.
Morphological description of microbes tells you very little about them because they are morphological very uniform. The variety in microbial life is at the metabolic and biochemical level - and that doesn't fossilise.