Caloneis elongata (Grunow) Boyer, 1927

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 : 123

Caloneis elongata (Grunow in Schmidt) Boyer (1927: 312) ( Fig. 33 )

References: Simonsen 1974, p. 42, pl. 26, fig.5; Witkowski et al. 2000, p. 164, pl. 152, fig. 10.

Features: Length: 58–90 μm, width: 8–12 μm, striae 18–20 in 10 μm.

Description: Valves linear with parallel margins and rounded apices. Raphe-sternum large with straight raphe fissures. Axial area narrow, central area rounded with crescent-like markings on both sides. Transapical striae parallel throughout.

Remarks: Specimens observed bear slightly higher striae density (15–18 in 10 μm in Witkowski et al. 2000).

Ecology and Distribution: Widely distributed marine species. Previously reported from the Gulf ( Hendey 1970, Al-Yamani & Saburova 2011). 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.