FIGURES 14–19 in A revision of the diatom genus Lyrella Karayeva (Bacillariophyta: Lyrellaceae) from the Black Sea, with descriptions of five new species

FIGURES 14–19: Figs 14–17: Lyrella pontieuxini sp. nov. Valve view, show variation in size and outline. LM, scale bar = 10 µm. Specimens from the Black Sea (Balaklava Bay, Omega Bay, Dvujakornaja Bay) Holotype is illustrated in Fig. 15. Fig. 18: Lyrella cf. pontieuxini, external view, SEM, scale bar = 20 µm. Fig. 19: Lyrella rattrayi comb. nov., reproduction of published line-drawing by H. & M. Peragallo (1874–1908: pl. 21, fig. 38) as Navicula abrupta var. rattrayi, scale bar = 10 µm.