Marine benthic diatoms in the newly discovered coral reefs, off Basra coast, Southern Iraq Author Al-Handal, Adil Y. Department of Biological and Environmental Sciences, University of Gothenburg, Sweden Author Thomas, Evan W. Biology Department, Waubonsee Community College, Sugar Grove, Illinois, USA Author Pennesi, Chiara Department of Life and Environmental Sciences, Polytechnic University of Marche, Ancona, Italia text Phytotaxa 2018 2018-10-12 372 2 111 152 http://dx.doi.org/10.11646/phytotaxa.372.2.1 journal article 10.11646/phytotaxa.372.2.1 1179-3163 13728822 Triceratium robertsianum Greville (1863) ( Fig. 10 ) References : Greville 1863 , pl. 9, fig. 9; Navarro 1981, p. 619, fig. 62. Features : Length between two angles 58–70 μm, areolae 3 in 10 μm. Description : Valves triangular with constricted rounded apices and concave margins. Middle part of the valve face slightly arched. Hexagonal areolae are distributed forming a quincunx structure. Ecology and Distribution s: A marine species more commonly found in warm waters. Previously reported from the Gulf ( Simonsen 1974 ). Rare in Basra corals.