Lyrella lyra (Ehrenb.) Karayeva (1978: 1593)

Nevrova, Elena, Witkowski, Andrzej, Kulikovskiy, Maxim, Lange-Bertalot, Horst & Kociolek, J. Patrick, 2013, A revision of the diatom genus Lyrella Karayeva (Bacillariophyta: Lyrellaceae) from the Black Sea, with descriptions of five new species, Phytotaxa 83 (1), pp. 1-38 : 29

Lyrella lyra (Ehrenb.) Karayeva (1978: 1593)

Basionym: Navicula lyra Ehrenb. (1841: 203)

Navicula lyra var. ehrenbergii Cleve (1895: 63)

Navicula lyra f. typica Hust. in A. Schmidt et al. (1874–1959: pl. 2, fig. 16)

Lyrella lyra var. ehrenbergii (Cleve) Guslyakov & Karayeva (2002: 11, Addendum A, nom. invalid)

Lyrella lyra f. typica (Hust.) Ryabushko (2006: 61 nom. invalid)

Valves elliptic to lanceolate with convex margins and obtusely rounded to shortly rostrate apices, length 50–210 µm, breadth 26–73 µm. Raphe straight, external central endings moderately distant, axial area usually narrow, linear, central area narrow transversely rectangular, connected to lateral areas. Lateral areas moderately broad, in general linear, parallel or usually in the middle constricted, encompassing ¼ to ½ of the valve width. Transapical striae in the marginal part of the valve slightly radiate, 7–14, usually 10–12 in 10 µm (cited from Witkowski et al. (2000: 229–230).

Distribution:—Marine species of cosmopolitan distribution, entering also the western Baltic Sea ( Witkowski et al. 2000); Black Sea, North-western region ( Guslyakov et al. 1992), Bulgarian (Temniskova- Topalova & Petrova-Karadjova 1998), Romanian ( Bodeanu 1987 –1988, Caraus 2002), Crimean (Proshkina- Lavrenko 1963a, Kucherova 1973, Guslyakov & Nevrova 1987, Nevrova 1996, 1999 a, 2010, Ryabushko & Ryabushko 2001, Nevrova & Revkov 2003, Senichkina et al. 2004) and Caucasian coasts ( Proshkina-Lavrenko 1963a, Nevrova 1999b).

Literature:— Ehrenberg (1841); Ehrenberg (1843: 419, pl. 1, fig. 9a); Schmidt et al. (1874–1959: pl. 2, fig. 16); Cleve (1895); Hustedt (1961 –1966: 500, fig. 1548); Hendey (1964: 209, pl. 33, fig. 2); Karayeva (1978: 1593–1596); Round et al. (1990: 460); Guslyakov et al. (1992, pl. 48, fig. 1–3); Ryabushko (2006: 61, no micrograph).