Pleurasiga echinocostata Espeland in Espeland and Throndsen, 1986. Cell 2.5-4.5 microns long, with single smooth flagellum surrounded basally by a pseudopodial collar. Lorica bell-shaped with 7 longitudinal costae, occasionally reduced to 6 or 5 in the posterior part, consisting of 3 costal strips, the 2 most anterior with a distal anterior dilatation. A single anterior transverse lorica ring consisting of 7 costal strips each with a terminal anteriorly pointing spine. Anterior longitudinal costa joining the middle of each coastal strip of the tranverse costa. Lorica length 7.5-10 microns, anterior diameter 5-8.3 microns Thje drawing is of a damaged lorica.
