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Description of Euglypha rotunda

The test is ovoid, and varies in transverse section from circular to oval as it tapers from the mid-body region to the aboral region. It is composed of approximately one hundred and twenty oval, shell-plates. The aperture is circular and surrounded by eight to fourteen evenly spaced apertural-plates. Each apertural-plate is ovoid, thickened at the denticulate margin and carries a large median tooth which is bordered by two or three smaller teeth. In both cultured and wild animals variation appears to be restricted to the occasional large individual, usually having double the normal complement of shell and apertural-plates. Shell length 22-54 microns, shell width 11-36 microns, diameter of aperture 6-12 microns, shell-plate length 5-8 microns, shell-plate width 2.5-4.5 microns, apertural plates length 4.5-5.5 microns, apertural plates width 3.6-4.5 microns.


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Source: BioPedia

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