Petroneis marina

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 marina (Ralfs in Pritchard) D.G. Mann in Round et al. (1990: 674) ( Fig. 19 )

References: Brockmann 1950, pl. 3, fig. 17; Hustedt 1961–1966 fig. 1697 (both as Navicula marina Ralfs in Pritchard (1861: 903); Witkowski et al. 2000, p. 328, pl. 102, fig. 1.

Features: length 40–64 μm, width 20–28 μm, striae 11–13 in 10 μm.

Description:Valves elliptical-lanceolate with rounded apices.Raphe branches straight, ending centrally in expanded pores. Central area slightly transapically dilated. Monoseriate transapical striae strongly radiate and composed of rounded areolae.

Remarks: Distinguished from the similar P. granulata D.G. Mann (in Round et al. 1990: 674) by having regularly spaced striae.

Ecology and Distribution: Widespread marine and brackish water 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.