Drawing

Description:

Calliacantha multispina Manton and Oates, 1979. Choanoflagellates with a conical lorica, 22 - 32 microns long with 4 or 5 longitudinal costae and two transverse costae. The costal strips forming the upper transverse costa are curved upwards, creating a convoluted appearance. The longitudinal costae project above the lorica chamber to form spines of a single costal strip in length. There is also a single posterior spine. The number of longitudinal costae undergoes reduction towards the posterior of the lorica. The main chamber of the lorica is lined with a membrane.