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Description of Diaphanoeca undulata

Solitary choanoflagellate; cell body when measured in dried preparations 4.0 - 6.4 x 2.4-3.1 microns: single anteriorly inserted flagellum (8-15 microns long) surrounded by a collar of tentacles about 2 microns long. Lorica (up to 65 microns long) consisting of one chamber (approximately 20 microns long) formed by 11 (12) longitudinal costae and three transverse costae. Each longitudinal costa consists of 5 costal strips. The two anterior transverse Costae are made of a number of costal strips which equals the number of longitudinal costae. The mode of attachment between longitudinal and transverse costal strips is basically end to end. The anterior transverse costa crosses the longitudinal costae at the junctions between the first and the second costal strip, leaving the anterior longitudinal costal strips as free projecting spines. The middle transverse costa crosses the longitudinal costae anterior to the junctions between the second and the third longitudinal costal strips. The distance between the two transverse costae (3 microns) is thus less than the length of one longitudinal costal strip. The posterior transverse costa is composed of much fewer costal strips (5-6) which cross the longitudinal costae at the junctions between the fourth and the fifth longitudinal costal strips counted from the anterior lorica end. Posteriorly the longitudinal costae converge and join with a pedicel (up to about 50 microns long).

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