Parlibellus sp.

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 : 122

Parlibellus sp. ( Fig. 27 )

Features: Length 80–95 μm, width 20–24 μm, striae 18–20 in 10 μm.

Description: Valves lanceolate, slightly curved with acutely rounded apices. Valve part on both side of the axial area is depressed, depression is wider in the middle and tapering towards poles. Raphe straight, slightly elevated in the upper and lower thirds of the valves. Axial area narrow, central area small and circular. Striae slightly radiate throughout, more spaced in the middle.

Remarks: The depressed part in the middle of the valve makes this species distinct from other known Parlibellus species.

Ecology and Distribution: Rare in Basra corals.

Figures

FIGURES 21–37. Marine benthic diatoms in coral reefs off Basra. Fig. 21. Mastogloia quinquecostata, Fig. 22. Cocconeis latecostata, Fig. 23. Berkeleya scopuloru, Figs 24, 25. Climaconei sp. Fig. 26. Parlibellus rhombiformis, Fig. 27. Parlibellus sp., Fig. 28. Biremis ambigua, Fig. 29. Fallacia forcipata, Fig. 30. Fallacia nummularia, Fig. 31 Fallacia sp., Fig. 32. Progonoia musca, Fig. 33. Caloneis elongata, Fig. 34. Caloneis liber, Fig. 35. Diploneis cf. interrupta, Fig. 36. Diploneis chersonensis, Fig. 37. Diploneis fusca.