Netzelia achlora (Penard, 1902) Gomaa et al., 2017
Diagnosis: Shell ovoid to elongated-ovoid, composed of a mixture of small pieces of quartz and siliceous particles (like diatom frustules), the particles are bound together with an organic cement. The aperture is trilobed and surrounded by a collar. The shell of N. achlora is very similar to N. gramen, but smaller in size.
Dimensions: Length: 58 µm, breadth: 46 µm, aperture diameter: 18 µm.
Ecology: Freshwater; not rare