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Comprehensive Description

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Description of Euglypha cristata

Testate amoeba, the lorica is shell is ovoid, circular in transverse section and is composed of about eighty, oval, shell-plates. The shell-plates are arranged in a regular pattern except for an opening in the centre of the aboral region, from which as many as eleven, long, thin, tapering, siliceous spines project. These long spines curve and intertwine, which suggests that they are not as rigid as the shorter spines of either E. compressa or E. strigosa. The aperture is circular and surrounded by either five, six, or seven denticulate apertural plates. Each apertural-plate is roughly circular and carries a large median tooth with either three or four smaller lateral teeth. The denticular margin of these plates is thickened. Shell length 33-70 microns, shell width 12-23 microns, diameter of aperture 6-12 microns, shell-plates length 4.5-9.8 microns, shell-plates width 2.5-7.5 microns, apertural plates length 7.8-9.2 microns, apertural plates width 5.9-6.4 microns, length of elongated shell-plates 10-31 microns

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