Petroneis granulata (Bailey) D.G.Mann

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 : 119

Petroneis granulata (Bailey) D.G.Mann in Round et al. (1990: 674) ( Fig. 18 )

References: Hendey 1964, p. 208, pl. 31, fig. 6 (as Navicula granulata Ehrenberg (1836: 220) ; Witkowski et al. 2000, p. 327, pl. 97, figs 1, 2.

Features: Length 90–124 μm, width 34–44 μm, striae 8–12 in 10 μm.

Description: Valves elliptical-lanceolate with protracted rostrate apices. Raphe branches straight, ending centrally in expanded pores. Transapical striae monoseriate, parallel at the center and radiate at the poles. Striae composed of rounded areolae more dense in the valve margin.

Remarks: P. granulata can be distinguished by striae structure which exhibit a more spaced and irregularly positioned areola around the axial area that become more compact and dense towards the margins.

Ecology and Distribution: Widespread marine littoral species. Previously reported from the Gulf ( Hendey 1970, Al-Handal 2009, Al-Yamani & Saburova 2011). Frequent in Basra corals.

Figures

FIGURES 11–20. Marine benthic diatoms in the coral reefs off Basra. Fig. 11. Actinocyclus curvatulus, Fig. 12. Actinocyclus octonarius, Fig. 13. Lyrella abrupta, Fig. 14. Lyrella clavata, Fig. 15. Lyrella hennedyi, Fig. 16. Lyrella hennedyi var. subcarinata, Fig. 17, Lyrella spectabilis, Fig. 18. Petroneis granulata, Fig. 19. Petroneis marina, Fig. 20. Petroneis sp.