Paraphysomonas acuminata Scoble & Cavalier-Smith

Kapustin, Dmitry A., Gusev, Evgeniy S., Lilitskaya, Galina G. & Kulikovskiy, Maxim S., 2020, Silica-scaled chrysophytes from the Ukrainian Polissia, Cryptogamie, Algologie 20 (12), pp. 121-135 : 123-124

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.

Figures

FIG. 1. — Chrysosphaerella Lauterborn, Paraphysomonas De Saedeleer emend. Scoble & Cavalier-Smith, Lepidochromonas Kristiansen and Spiniferomonas E.Takahashi species from the Ukrainian Polissia:A, Chrysosphaerella brevispina Korshikov,spine scale,TEM;B, Stomatocyst of Chrysosphaerella coronacircumspina Wujek & Kristiansen with broken spine scale and plate scales, SEM; C, Paraphysomonas acuminata Scoble & Cavalier-Smith, TEM; D, Paraphysomonas truncata (Preisig & D.J.Hibberd) Scoble & Cavalier-Smith, TEM; E, Paraphysomonas sp., scale with broken spine, SEM; F, Lepidochromonas sp., TEM; G, Spiniferomonas bourrellyi E.Takahashi,spine scale with plate scales attached to it, SEM;H, Spiniferomonas cf.trioralis E.Takahashi, spine scale,SEM;I, Chrysosphaerella longispina J.B.Petersen & J.B.Hansen, SEM. Scale bars: A, D, E, G, H, 1 µm; B, C, 2 µm; F, 0.5 µm; I, 5 µm.