Drawing

Description:

Acanthocorbis haurakiana Thomsen in Thomsen et al., 1991. Conical lorica 20-27 microns long, including a posterior spine. One transverse costa at the anterior of the lorica, with the most anterior costal strip of each of 6 longitudinal costae projecting as a spine. The costal strips forming the anterior spines and the posterior spine are tapered distally. There is a band of rather obliquely arranged costae around the protoplast in the middle of the main lorica chamber.