Abstract The echinoid fauna from the Miocene sedimentary
succession cropping out south Wadi Tweirig, and Wadi
Hommath, south Gebel Ataqa, NW Gulf of Suez, has been
examined with the aim to known their stratigraphic and paleogeographic
distribution. The Miocene succession includes
two formations: Sadat Formation, unconformably overlying
the middle/upper Eocene rocks at the base and Hommath
Formation at the top. Twenty-eight echinoid species (8 regular
and 20 irregular) belonging to 18 genera, 13 families, and 7
orders have been identified, systematically described, and illustrated
in this work. Eleven species are recorded for the first
time from Egypt: ten of these came from the Hommath
Formation (Schizechinus cf. serresii Desor (1856),
Schizechinus pentagonus Kier 1972, Clypeaster cf. martini
des Moulins 1837, Scutella checchiae occidentalis Desio
1934, Scutella melitensis Airaghi 1902, Echinodiscus desori
Duncan and Sladen 1883, Echinolampas cf. zeitensis Fourtau
1920, Schizaster lovisatoi Cotteau 1895, Agassizia
(Agassizia) powersi Kier 1972, and Hemipatagus ocellatus
Defrance (1827)), and one from the Sadat Formation
(Clypeaster campanulatus Schlotheim (1820)). The identified
fauna shows a strong affinity with the Mediterranean bioprovince