Paraphysomonas acuminata Scoble & Cavalier-Smith

(Fig. 1C)

Paraphysomonas imperforata Lucas pro parte, Journal of the Marine Biological Association of the United Kingdom 47: 330 (1967).

DISTRIBUTION. — Probably widely distributed; all previous freshwater records of P. imperforata should be revised.

REMARKS

This species has oval basal plate of scales (1.7 × 1.3 µm) with annulus and long spine (4.95 µm) with acutely pointed tip.

Our specimens could be identified as P. imperforata Lucas sensu lato . Scoble & Cavalier-Smith (2014) pointed out that the spine length of the marine species P. imperforata is 1/10 the spine length of P. acuminata which occurs in freshwaters.