Tryblionella didyma (Hustedt) 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 : 141

Tryblionella didyma (Hustedt) D.G. Mann (in Round et al. 1990: 678) ( Fig. 99 )

References: Hustedt 1952, fig. 20; Liu et Chin 1980, fig. E. as Nitzschia didyma Hustedt (1952: 309)

Features: Length 60–73 μm, width 14–16 μm, fibulae 14–16 in 10 μm, striae 26–28 in 10 μm.

Description: Valves linear elliptic with shallowly constricted sides and broadly cuneate apices. Raphe eccentric, fibulae distinct, rectangular. Transapical striae interrupted by distinct, slightly lateral and elevated rib.

Remarks: Witkowski et al. (2000, figs 185: 1, 186: 14, 15) illustrated N. didyma but did not provide any description. Our specimens match those illustrations.

Ecology and Distribution: Limited distribution, found in Taiwan (Fujian Coast, Liu et Chin 1980) and China ( Liu 2008). Not recorded previously from the Gulf. Rare in Basra corals.

Figures

FIGURES 91–102. Marine benthic diatoms in coral reefs off Basra. Fig. 91. Nitzschia behrei, Fig. 92. Nitzschia distans, Fig. 93. Nitzschia fluminensis, Fig. 94. Nitzschia lorenziana, Fig. 95. Nitzschia sigma, Fig. 96. Nitzschia sp., 97. Pssamodictyon panduriformis Fig. 98. Tryblionella coarctata, Fig. 99. Tryblionella didyma, Fig. 100. Tryblionella nicobarica, Fig., Fig. 101. Amphiprora sulcata, Fig. 102. Auricula intermedia.