Fig. 3

(Scale bar = 10 mm, unless otherwise stated): a Acropora stoddarti Pillai & Scheer 1976. S 18-2, Pleistocene raised reefs (T I), Wadi Samadai; a1 upper surface of the corallum with many small proliferations; a2 enlarged part of the upper surface showing the very crowded and immersed radials; a3 enlarged part of the lower surface showing immersed and widely spaced radial corallites b Acropora spicifera (Dana 1846), Sh.L 5-12, Samadai Formation, Wadi Sharm El-Luli; b1 a small corallum with short branches; b2 close-up view showing anastomosing branches with radial corallites. c Acropora squarrosa (Ehrenberg 1834), S 20-15, Pleistocene raised reefs (T III), the northern side of Marsa Samadai; c1 a small ramose corallum; c2 close-up view on the branch tip showing the axial and radial corallites; c3 close-up view on radial corallites with thick lip and very small rounded openings