Parlibellus rhombiformis (Hustedt) Cox (1988: 25)

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 rhombiformis (Hustedt) Cox (1988: 25) ( Fig. 26 )

References: Simonsen 1987, p. 490, pl, 472, figs 1–3; Witkowski et al. 2000, p. 326, pl. 103, fig. 8.

Features: Length 60–68 μm, width 21–22 μm, striae 20–22 in 10 μm.

Description: Valves rhombic-lanceolate with rounded, slightly produced apices. Raphe straight, terminal endings terminate below apices. Axial area narrow, central area small, elliptical. Transapical striae radiate, finely punctate.

Remarks: A slightly larger specimen with coarser striae were observed.

Ecology and Distribution: A rare marine tropical species. Not recorded previously from the Gulf. 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.