Navicula distans (W. Smith) A. Schmidt

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 : 128

Navicula distans (W. Smith) A. Schmidt (1854: pl. 46, figs 11–14) ( Fig. 51 )

References: Hendey 1964, p. 203, pl. 27, fig. 13; Witkowski et al. 2000, p. 275, pl. 143, figs 1–4.

Features: Length 91–110 μm, width 18–20 μm, striae 6–7 in 10 μm.

Description: Valves lanceolate to weakly rhombic with apiculate apices. Raphe branches straight, ending centrally in simple pores. Axial area narrow, central area rounded to irregular. The coarse transapical striae are slightly radiate at the center becoming parallel toward the apices.

Remarks: A large species with strong and coarse lineolate striae.

Ecology and Distribution: A widely distributed marine species. Not reported previously from the Gulf. Frequent in Basra corals.

Figures

FIGURES 38–51. Marine benthic diatoms in coral reefs off Basra. Fig. 38. Diploneis gemmatula, Fig. 39. Diploneis nitescens, Fig. 40. Diploneis smithii, Figs 41, 42. Diploneis weissflogii, Fig, 43. Diploneis sp., Fig. 44. Navicula arenaria, Fig. 45. Navicula cancellata, Figs 46–48. Navicula carinifera, Fig. 49. Navicula cf. cincta, Fig. 50. Navicula directa, Fig. 51. Navicula distans.