Ralfsiella minima, Sims, Pat A., Williams, David M. & Ashworth, Matt, 2018

Sims, Pat A., Williams, David M. & Ashworth, Matt, 2018, Examination of type specimens for the genera Odontella and Zygoceros (Bacillariophyceae) with evidence for the new family Odontellaceae and a description of three new genera, Phytotaxa 382 (1), pp. 1-56 : 44

Ralfsiella minima (Grunow in Van Heurck) P.A. Sims & D. M. Williams, comb. nov.

Basionym: — Biddulphia aurita var. minima Grunow in Van Heurck (1882: pl. 98, figs 11–13)

Synonym: — Odontella aurita ( auritum ) var. minima (Grunow in Van Heurck) De Toni (1894: 863)

Type:—Belgium: Figs 11, 12 , “ Blankenberghe”; FRANCE: Fig. 13 [text as Fig. 12 ], “de l’ile de Bréhat” (Grunow in Van Heurck 1882: pl. 98, figs 11–13)

Figures

FIGURES 8–13. Trieres regia (M.Schultze) Ashworth & E.C. Theriot (Bonny River, Nigeria). Fig. 8. Reproduction of illustrations for Denticella regia from Schultze (1859: figs 11 and 12) (not to scale). Fig. 9. Valve exterior tilted, apices with narrow outwardly directed elevations, broad mantle narrowing to acute apices and marginal ridge extending between elevations; scale bar = 43 μm. Fig. 10. Valve face fractured showing loculate areolae and scattered spinules on face and mantle; scale bar = 2 μm. Fig. 11. Valve flat with lanceolate valve face, semi-lanceolate mantle and narrow annulus (sternum) extending just beyond hollow spines, which are the openings from rimoportulae; scale bar = 38 μm. Fig 12. Elevation with small flat summit and ocellus on distal face; scale bar = 2.5 μm. Fig. 13. Detail of narrow annulus (arrow) (sternum) bordered by transapical rows of poroids; scale bar = 7.5 μm.