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Description of Calliacantha simplexChoanoflagellates with a conical lorica, 22 - 41 microns long with four longitudinal costae and two transverse costae. Strips forming the upper transverse costae are curved slightly downwards. The longitudinal costae project above the lorica to form projections about one and a half costal strips long. There is also a single posterior spine, usually formed from a single costal strip, but occasionally from two strips.