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Description of Crinolina aperta

The lorica is barrel-shaped and open at both ends, with a long fringe of slender projecting costae round each opening. Overall length 45-50 microns, width at the anterior end 17-25 microns, at the posterior end 25-35 microns. Number of longitudinal costae 12, each composed of 9 or 10 costal strips with overlapping ends and with two, firmly constructed, transverse costae located respectively at a distance of 2 costal strips from the anterior end of the lorica and 3 or 4 costal strips from the posterior end. Transverse costal strips L-shaped, tapered at one end and sharply upturned at the: other, those from the anterior ring thicker than those from the posterior ring but i both thicker than the longitudinal costae; all upturned tips in both transverse costae directed towards the anterior end of the lorica and each individually 1 attached to the corresponding longitudinal costa. Protoplast located centrally, about 8 microns long x 5 microns wide, with a flagellum about 40 microns long and a ring of about 50 tentacles, each up to 8 microns long


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Source: BioPedia

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