Raphidiophrys viridis Archer, 1867
Diagnosis: Cells usually in colonies, each colony with 5-18 individuals; individuals ca. 50 µm in diameter; scales rodlike, with strongly inflexed margins, leaving a narrow slit; exterior of the scale ornamented with rows of papillae; papillae at the poles ca. 0.1 µm high, becoming smaller towards the centre of the scale; scales sometimes capitate at the rounded poles; scales 15-37 µm long and ca. 1 µm wide; number of septa along the margin 50-60 per 10 µm.
Remarks: The existence of septa in scales of this species was noticedby Penard (1904), unaware of the real meaning of the striations he saw. Similar striations were seen by Siemensma (1981) on scales embedded in Naphrax. This image is caused by air trapped between the two scale plates and the septa.
Raphidiophrys viridis was collected in Sphagnum pools in the Netherlands. Rather common.