Petroneis sp.

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 : 120

Petroneis sp. ( Fig. 20 )

Features: length 59 μm, width 23 μm, striae 9 in 10 μm.

Description: Valves elliptic-lanceolate with obtusely rounded apices. Raphe straight, axial area narrow, central area round. Striae interrupted by semi-lanceolate hyaline area. Marginal striae are longer in the middle, axial striae are short composed of 2–3 areolae which are irregularly spaced. Striae parallel in the middle, becoming convergent towards apices.

Ecology and Distribution: Rare 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.