Coscinodiscus marginatus Ehrenberg (1843: 412)

Al-Handal, Adil Y., Thomas, Evan W. & Pennesi, Chiara, 2018, Marine benthic diatoms in the newly discovered coral reefs, off Basra coast, Southern Iraq, Phytotaxa 372 (2), pp. 111-152 : 116

Coscinodiscus marginatus Ehrenberg (1843: 412) ( Fig. 9 )

References: Hendey 1964, p. 78, pl. 22, fig.2; Desikachary 1988, pl. 537, figs 1–4, pl. 538, figs 1–6.

Features: Diameter 41–70 μm.

Description: Valves circular, convex with large hexagonal areolae arranged in quincunx structure. Marginal areolae smaller in size, central area absent. Valve margin broad.

Remarks: Deposited from the plankton.

Ecology and Distribution: A widely distributed pelagic species. Previously reported from the Gulf ( Al-Kandari et al. 2009). Frequent in Basra corals.

Figures

FIGURES 2–10. Marine benthic diatoms in the coral reefs off Basra. Fig. 2. Cyclotella striata, Fig. 3. Cyclotella stylorum, Fig. 4. Tryblioptychus cocconeiformis, Figs 5, 6. Podosira stelliger, Fig. 7. Paralia sulcata, Fig. 8. Coscinodiscus centralis, Fig. 9. Coscinodiscus marginatus, Fig. 10. Triceratium robertsianum.