The Echinoid Directory

Egyptechinus Lambert, 1936, p. 41

Diagnostic Features	Test small, flattened below, weakly domed above. Apical disc modest, possibly subcircular, about one-third test diameter in length. Plates not bound to corona, always missing. Ambulacra straight; plating trigeminate throughout, compounded in glyptechinid style one small demiplate alternating with two full elements bearing a tubercle, the lower of the two being the larger). Pore-pairs undifferentiated; uniserial adapically, but in offset lines of three at ambitus and adorally, No phyllodes. A single primary tubercle to each compound plate; test too worn to identify secondaries. Interambulacral plates a little wider than tall; with a single primary tubercle, positioned centrally; small secondary tubercle interradially and one or two along adradial margin of ambital and subambital plates. Tubercles imperforate and crenulate. Peristome about half test diameter, circular, sunken, with small, but clearly defined buccal notches with thickened lip; no tag. No sphaeridial pits; no basicoronal interambulacral plate. Spines unknown. Lantern unknown.
Distribution	Eocene (Lutetian), Egypt
Name gender	masculine
Type	Orthechinus (Egyptechinus) cuvillieri Lambert, 193, p. 41, by original designation.
Species Included	Only the type species.
Classification and/or Status	Euechinoidea, Echinacea, incertae sedis. Monotypic.
Remarks	Lambert (1936) states that it differs from Orthechinus and Thylechinus in having poriferous zones pseudotrigeminate over the oral surface and simple only aborally. Lambert, J. 1936. Sur quelques nouveaux echinides fossiles d'Egypt. Bulletin de l'Institute d'Egypte, 18, 39-43, 1 pl.