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Paulinella
Paulinella chromatophora, dividing

Genus Paulinella Lauterborn, 1895

Diagnosis: shell pyroid or broad-elliptical, not compressed, composed of siliceous, rectanguloid plates with slightly rounded, scarcely overlapping borders, arranged in circumferential longitudinal rows; in apertural view the plates form a counter-clockwise spiral, with one pentagonal scale at the aboral pole. Pseudostome small. Cell with usually two sausage-like organelles: endosymbionts of cyanobacterial origin. Filopodia, usually fast moving.

Paulinella
Paulinella
Granulated nucleus, after division, and empty shell, stacked image
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