Trachyneis debyi (Leuduger-Fortmorel) Cleve (1894: 193)

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 : 130

Trachyneis debyi (Leuduger-Fortmorel) Cleve (1894: 193) ( Fig. 59 )

References: Simonsen, 1974: p. 43, Pl. 27: 1; Pl. 28: 1; Desikachary, 1989, pl. 762, fig. 11; Al-Handal, 2009: p. 26, figs 191, 193.

Features: Length 90–140 μm, width 19–26 μm, striae 10–12 in 10 μm.

Description: Valves narrowly lanceolate with rounded apices. Valve face strongly arched. Raphe branches straight, ending centrally in simple pores. Axial area narrow, slightly asymmetrically dilated in one direction, central area rounded, transapically dilated, with two semi-lunate furrows on each side. Areolae are irregular in shape and arranged in transverse and oblique rows. Transapical rows parallel throughout.

Ecology and Distribution: A widespread marine species, particularly in warm waters. Previously reported from the Gulf ( Hendey 1970, Simonsen 1974, Al-Handal 2009, Al-Yamani & Saburova 2011). Frequent in Basra corals.

Figures

FIGURES 52–61. Marine benthic diatoms in coral reefs off Basra. Fig. 51. Navicula distans., Fig. 52. Navicula kariana var. frigida, Fig.53. Navicula transistantioides, Fig.54. Navicula sp., Fig. 55.Seminavis sp., Fig.56.Trachyneis antillarum, Fig.57.Trachyneis aspera, Fig. 58. Trachyneis clepsydra, Fig. 59. Trachyneis debyi, Fig. 60. Tracyneis velata, Fig. 61. Donkinia carinata.