The Echinoid Directory

• Test depressed above and below.
• Apical disc about 30% test diameter; plates firmly bound to corona. Plating hemicyclic with ocular plates I and V exsert.
• Ambulacra more or less straight; plating trigeminate throughout with pore-pairs uniserial. Plate compounding glyphocyphid style with all three elements reaching the perradial suture.
• Primary tubercle on each compound plate. Deep and irregular perradial pitting in the form of horizontal wedge-shaped pits.
• Interambulacral plates wide; with a small central primary tubercle the remainder of the plate with small granules arranged in two or three horizontal rows.
• Primary tubercles perforate and crenulate.
• Well developed horizontal wedge-shaped pits on either side of primary tubercle and coalescing interradially to form more or less continuous vertical groove.
• Peristome small with only feeble buccal notches.
• Perignathic girdle, lantern and spines unknown.

Eocene, Europe, North Africa, Pakistan.

Dictyopleurus douvillei Lambert, 1932, by original designation.

• A. douvillei Lambert, 1932; Priabonian; Egypt
• A.duncani
• A. archiaci
• A. fabrei Jeannet, 1936;
• A. neuvillei Lambert 1928
• A. viladensis Carrasco, 2007; Middle Eocene, Spain

Euechinoidea, Camarodonta, Temnopleuroida

Close to Rhabdopleurus Cotteau, 1893 but differing in having long sutural pits on either side of the primary tubercles.  In Rhabdopleurus there is a single triangular pit underneath each primary tubercle.

See Carrasco (2007) for a recent description.

Lambert, J. 1932. Etude sur les Echinides fossiles du Nord de l'Afrique. Memoires de la Societe geologique de France nouvelle Serie, 7(4), 109-228, pls 5-8.

Carrasco, F. F. 2007. Una nueva especie del genero Ambipleurus (Echinoidea) del Eoceno medio del Noreste de Espana. Primera cita del genero en la Peninsula Iberica. Scriptas Musei Geologici Seminarii Barcinonensis. Series Palaeontologica 2, 3-18.