Triceratium robertsianum Greville (1863)

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

Triceratium robertsianum Greville (1863) ( Fig. 10 )

References: Greville 1863, pl. 9, fig. 9; Navarro 1981, p. 619, fig. 62.

Features: Length between two angles 58–70 μm, areolae 3 in 10 μm.

Description: Valves triangular with constricted rounded apices and concave margins. Middle part of the valve face slightly arched. Hexagonal areolae are distributed forming a quincunx structure.

Ecology and Distribution s: A marine species more commonly found in warm waters. Previously reported from the Gulf ( Simonsen 1974). Rare 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.