Drawing

Description:

Acanthocorbis prolongata Thomsen et al., 1997. Cells are solitary, attached to the substratum by means of a cluster of costal strips terminating a simple pedicel, about 30 microns long and consisting of up to 8 linearly arranged costal strips. Lorica funnel shaped, about 13 microns long, and with anterior projections (8-10) that continue downwards as longitudinal costae. The length of an anterior projection equals one costal strip. The anterior transverse costa (diameter about 5 microns) consists of 8-10 strips with considerable overlaps between neighbouring strips and a small vertical displacement (about 0.4 microns) between strips where they attach to or cross a longitudinal costa. Costal strip arrangement at the posterior lorica end is somewhat more irregular, although 2 transverse costae are discernible. Costal strips are rod-shaped, and 3-4 microns long. The protoplast, about. 4x3 microns, is posteriorly located within the lorica. The single flagellum is about 7 microns long, surrounded by a ring of tentacles (each about 2 microns long), and with a conspicuous hairpoint.