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Description of Diaphanoeca multiannulataChoanoflagellates with barrel-shaped lorica, 55-60 microns high excluding posterior spine, 24-25 microns wide (maximum), composed of 12 (or 11) longitudinal costae converging at posterior end and five transverse costal rings. Longitudinal costa consists of 12 (or 13) costal strips, each 6 microns long, one and a third costal strips project as free end spines beyond the anterior transverse costal ring. Transverse costal rings consist of 10-11 costal strips each, about 6 microns long, and spaced at intervals of one and a third, four and a half, six, eight and nine costal strips from anterior end of longitudinal costae. Overall length 61-66 microns.