Lyrella spectabilis (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 : 119

Lyrella spectabilis (Gregory) D.G. Mann in Round et al. (1990: 673) ( Fig. 17 )

References: Hustedt 1961–66, p. 474, fig. 1532 (as Navicula spectabilis Gregory (1857: 481) ; Witkowski et al. 2000, p. 236, pl. 95, figs 1, 2, pl. 96, fig.1, pl. 99, fig. 1.

Features: Length 85–130 μm, width 40–64 μm, striae 7–9 in 10 μm.

Description: Valves broadly elliptical with rounded apices and straight raphe fissures. Hyaline lateral areas lanceolate, becoming narrower near the apices. Transapical striae parallel at the center and strongly radiate at the poles.

Remarks: This species differs from Lyrella hennedyi (W.Smith) Stickle & D.G.Mann (in Round et al. 1990: 672) and L. lyra (Ehrenberg) Karajeva (1978: 1595) by the shape of the axial area.

Ecology and Distribution: A widely distributed marine species. Previously reported from the Gulf ( Hendey 1970). 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.