The Echinoid Directory

• Test hemispherical with flattened broad base and domed upper surface.
• Apical disc unknown.
• Ambulacra relatively narrow and straight. Composed of trigeminate compound plates throughout. Each compound plate with a large primary tubercle. There is a well-developed perradial zone of granules.
• Weak phyllodes developed adorally.
• Interambulacral plates extremely wide and low with four or more subequal primary tubercles on ambital and subambital plates. Adapical plates with fewer tubercles.
• Peristome relatively small.
• Lantern present but details not recorded.
• Spines unknown.

Early Jurassic (Hettangian); France.

Diademopsis bonissenti Cotteau, 1976, by original designation.

• Only the type species.

Pedinoida, Pedinidae.

Subjective junior synonym of Diademopsis.

Pomel (1883) originally erected this genus in the belief that it had 4 or 5 elements to each compound plate. However, this is a mistake as it has just three elements. Mortensen (1940, Monograph of the Echinoidea III, p. 81) placed this as a junior synonym of Diademopsis.

Mortensen, T. 1940. A Monograph of the Echinoidea. III, 1. Aulodonta, with Additions to Vol. II (Lepidocentroida and Stirodonta). C. A. Reitzel, Copenhagen, 370 pp.

Pomel, A. 1883. Classification méthodique et Genera des Échinides vivante et fossiles. Thèses présentées a la Faculté des Sciences de Paris 503, A. Jourdan, Alger, 131 pp.