Lyrella abrupta (Gregory) 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 : 117

Lyrella abrupta (Gregory) D.G. Mann in Round et al. (1990: 674) ( Fig. 13 )

References: Hustedt 1961–66, p. 516, fig. 1558; Hendey, 1964, p. 210, pl. 33, fig.12 (as Navicula abrupta (W.Gregory) Donkin 1870: 13 ); Witkowski et al., 2000, p. 229, pl. 95, figs 4, 5; pl. 99, fig. 8.

Features: Length 40–56 μm, width 16–20 μm, striae 14–17 in 10 μm.

Description: Valves elliptical with broadly rounded apices and straight raphe fissures. Narrow lanceolate lateral hyaline areas slightly expanded, becoming narrower near central pores and terminal fissures.

Remarks: Observed specimens were with slightly higher striae density than originally described.

Ecology and Distribution: A widely distributed marine species. Previously known from the Gulf ( Hendey 1970, Al-Yamani & Saburova 2011, Al-Handal 2009). 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.