Goniopygus innesi Gauthier, 1901

Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, Geodiversitas 34 (3), pp. 575-615 : 595

Goniopygus innesi Gauthier, 1901 ( Fig. 8L, M)

Goniopygus innesi Gauthier in Fourtau, 1901: 60, pl. 1, figs 6-9. — Abdelhamid 1997: 146, fig. 5 (9). — El Qot 2006: 138, pl. 31, fig. 13; pl. 32, figs 1, 2a, b.

MATERIAL EXAMINED. — 16 specimens, numerous nonmeasured and frequent radioles from the Coniacian- Santonian of Abu Roash (Ostrea and Plicatula unit), ASUARE56-71, Abu Roash echinoid horizons 2 and 4 ( REH 2, REH 4).

MEASUREMENTS. — See Table 7.

DESCRIPTION

Adapical surface dome-shaped, occasionally flattened. Apical disc large, raised around the periproct and at its periphery. The oculogenital plates and the sutures between them smooth ( Fig. 8L). The inner edges of three of the genital plates carrying small granule on a semi-lunar depression. Ambulacral are wide at peristome. Poriferous zones slightly crowded near peristome. Ambulacral plates trigeminate.Interambulacral area with two columns of imperforate, noncrenulated, confluent primary tubercles. Peristome large, slightly sunken. Periproct sub-round. Radioles long; shaft solid, smooth, thick at the base, tapering top-wards ( Fig. 8M), flattened; collar smooth.