Trochalosoma (Trochalosoma) gharamulensis Abdelhamid & Azab, 2003

Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, Geodiversitas 34 (3), pp. 575-615 : 594-595

Trochalosoma (Trochalosoma) gharamulensis Abdelhamid & Azab, 2003 ( Fig. 8N)

Trochalosoma (Trochalosoma) gharamulensis Abdelhamid& Azab, 2003: 860 , pl. III, figs B-D. — El Qot 2006: 138, pl. 31, figs 11, 12.

MATERIAL EXAMINED. — Three specimens from the Turonian of Wadi Abu Qaada (Wata Formation), AS- UAQE 70-72, Wadi Abu Qaada echinoid horizon 1 ( QEH 1).

DESCRIPTION

Outline pentagonal to round. Adapical surface flattened to feebly convex. Adoral surface not depressed around peristome. Ambulacral area wide, feebly swollen. Poriferous zones biserial and wide adapically constituting most of ambulacrum width near apical disc, narrow and uniserial at ambitus, wide and crowded near peristome forming oblique triads of pore pairs.Major ambulacral plates trigeminate near peristome, quadrigeminate at ambitus, polygeminate with five pore pairs near apical disc. Interambulacral area with two columns of imperforate, noncrenulated primary tubercles; beside two external columns of secondary, nonconfluent tubercles as large as the primary tubercles but don’t persist until peristome and apical disc. Gill slits conspicuously developed.

REMARKS Abdelhamid & Azab (2003) erected this species from the Cenomanian of Gabal Gharamul, the Eastern Desert, Egypt. It is recorded here from the Turonian of Wadi Abu Qaada, west Sinai, Egypt.

Order ARBACIOIDA Gregory, 1900