Grammatophora cf. macilenta W.Smith, 1856

Al-Handal, Adil Y., Compère, Pierre & Criobe-Usr, Catherine Riaux-Gobin, 2016, Marine benthic diatoms in the coral reefs of Reunion and Rodrigues Islands, West Indian Ocean, Micronesica 2016 (3), pp. 1-78 : 12-13

Grammatophora cf. macilenta W.Smith (Pl. 4, fig. 15) References: Hustedt 1931 -59, p. 39, fog. 564; Witkowski et al. 2000, p. 58, pl.15, figs 16-18. Features: Apical axis 60-70 µm, girdle width 14-16 µm. Frustules narrow, oblong with two straight and parallel septa penetrating to almost near the center of the frustule. Remarks: All specimens observed were in girdle view. Very similar to G. macilenta but did not have a slightly bent frustule nor the wavy septa in the upper part of the frustule.

Grammatophora oceanica (Ehrenberg) Grunow (Pl. 4, Figs 14) References: Hustedt 1931 -59, fig. 573; Witkowski et al. 2000, p.58, pl. 15, figs 13, 14, pl. 16, fig. 12, pl. 17, figs 3, 4; Lobban et al. 2012, p. 262, pl. 19, Figs 6-8.

Features: Apical axis: 25-50 µm, transapical axis: 6-8, striae 24-25 in 10 µm. Frustules rectangular in girdle view with rounded corners and slightly wavy septa.

Remarks: Cells were only observed in girdle view. Widespread species in all marine and brackish waters.

Occurrence: Frequent in Reunion and Rodrigues Islands. Previously reported from Seychelles (G) and Mauritius (D).