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Description of Euglypha filiferaTestate amoeba, the lorica is ovoid, slightly compressed, and composed of about one hundred and fifty oval shell-plates. Siliceous spines project from the lateral margins, usually in the aboral half of the shell. These spines are long, thin and may be single or in groups of two or three. The aperture is circular and surrounded by eight to eleven apertural-plates. Each apertural-plate is oval, thickened at the denticulate margin, has a large median tooth and two smaller lateral teeth on each side. Variation appears to be restricted to the location of the spines. Shell length 53-70 microns, shell width 25-35 microns, diameter of aperture 10-14 microns, shell-plates length 8.6-10.8 microns, shell-plates width 4.5-5.4 microns, apertural plates length 8.0-9.3 microns, apertural plates width 4.9-5.4 microns, length of elongated shell-plates 13-23 microns.