Lyrella lyra var. subcarinata (Grunow) Moreno, 1996

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

Lyrella lyra var. subcarinata (Grunow) Moreno in Moreno et al. (1996: 88) ( Fig. 16 )

References: Hendey 1951, p. 50, pl. 10, figs 2,3; Moreno et al. 1996, p. 88; pl. 24, fig. 1; Desikachary 1989, pl. 640, fig. 10 (all as Navicula subcarinata Hendey 1951: 50 ).

Features: Length 80–140 μm, width 40–52 μm, striae 13–15 in 10μm.

Description: Valves broadly elliptical with sub-rostrate apices and straight raphe fissures. Hyaline lateral areas narrow. Transapical striae parallel throughout the length of the valve.

Remarks: The main characteristic feature that differentiate this variety from the type is the shape of the central area which is more elevated, a reason that led Hendey (1951) to consider it as a distinctive species.

Ecology and Distribution: Widely distributed marine species. Previously reported from the Gulf (Al-Yamani & Saburova 2011). Frequent in the material examined.

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.