Gyropaigne mirabilis R. E. Romanov 2025, comb. nov.

Gyropaigne mirabilis (Playfair) R.E.Romanov, comb. nov. Basionym: Sphenomonas mirabilis Playfair Proceedings of the Linnean Society of New South Wales 46: 140, pl. IX [9]: figs 4, 5, 1921 ≡ Rhabdomonas mirabilis (Playfair) Schroeckh, Won J.Lee & D.J.Patterson Hydrobiologia 493(1): 161, 2003 Lectotype (icon! designated here): Playfair 1921: pl. IX [9]: fig 5. Isolectotype: Playfair 1921: pl. IX [9]: fig. 4. Registration (of name): http://phycobank.org/105197 Registration (of lectotype): http://phycobank.org/105198 Syntype localities (Playfair 1921: 140): Australia, the neighbourhood of Lismore, different water bodies: “a swampy pool formed entirely with surface water”—sample 345 (Playfair 1918: 497, 498), plankton of unreported habitat—sample 328 (Playfair 1918: 497), unreported habitat— sample 365. Note: Playfair (1921) does not specify from which of the samples cited the illustrations were made. Both are in the vicinity of Lismore, New South Wales, Australia. Gyropaigne mirabilis is similar to G. spiralis (Matvienko) Bourelly & Georges and G. ucrainica Asaul in cell shape and appearance of cytoplasm as retracted from pellicle. It differs in less pellicle striae—6 vs. 12 and 10–14, and wider cells. Additionally, G. mirabilis differs from G. spiralis in larger cells, another direction of spiral striae of pellicle, widely rounded apical poles of cells, a shorter flagellum, and apical to slightly subapical opening of flagellar pocket in contrast to clearly subapical one of the latter species.