Phymosoma major ( Coquand, 1862 )

Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, Geodiversitas 34 (3), pp. 575-615 : 586-587

Phymosoma major ( Coquand, 1862) ( Fig. 5K)

Cyphosoma major Coquand, 1862: 256 , pl. 27, figs 16- 18. — Cotteau 1864: 596, pls 1143, 1144.

Phymosoma majus – Lambert 1937: 73, pl. 1, fig.16. — Zaghbib-Turki 1975: 29, pl. 1, figs 13-15. — Néraudeau et al. 1993: 290, pl. 3, figs A-G.

Phymosoma major – El Qot 2006: 136, pl. 31, fig. 3; 2010: 270, pl. III, figs 8a, b, 9.

MATERIAL EXAMINED. — One specimen from the Turonian of Wadi Abu Qaada (Wata Formation), ASUAQE4, Wadi Abu Qaada echinoid horizon 1 ( QEH 1).

DESCRIPTION

Test large (D = 33.5 mm). Adapical surface fairly high (H/D = 0.50). Ambital ambulacral plates quadrigeminate. Poriferous zones conspicuously biserial above the ambitus. Interambulacral area with four columns of large, imperforate, crenulated primary tubercles.

REMARKS

Bandel & Geys (1985) referred the present species (based on specimens with uniserial poriferous zone from the Coniacian of Jordan) to genus Rachiosoma Pomel, 1883 . Abdelhamid & El Qot (2001) submitted arguments against referring of the present species to Rachiosoma Pomel, 1883 . They erected a new species: Rachiosoma geysi Abdelhamid & El Qot, 2001 based on the Jordanian specimens and similar specimens from the Turonian of Gabal El-Minsherah, north Sinai. Phymosoma major is distinguished from Phymosoma abbatei , Phymosoma baylei , and Phymosoma beadnelli in having four columns of primary tubercles on each interambulacrum.

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