The Echinoid Directory

• Test subglobular, flattened below, gently domed above.
• Apical disc small, dicyclic; plates firmly bound to corona. Genital plates pentagonal, with gonopore towards interradial point; ocular plates small and strongly projecting. All plates covered in glassy pegs, one large knob on each genital plate. Periproct small, subcircular to subpentagonal.
• Ambulacra straight; pore-pairs uniserial, except adorally where they expand to form a short phyllode. Aboral pore-pairs with the two pores larger and more widely separated than adorally, but not conjugate.
• Ambulacral plating trigeminate throughout; plating not evident, but with one large element in each triad.
• Interambulacral plates wide.
• Tuberculation: aboral surface to ambitus without primary tubercles but covered in small non-articulating pegs, rather irregularly arranged. Primary tubercles developed subambitally; a single series in both the ambulacral and interambulacral zones. Primary tubercles imperforate and non-crenulate.
• Basicoronal plate small; not projecting interradially; without primary tubercle.
• Sphaeridial pits appear to be absent.
• Peristome subcircular, with only the feeblest of buccal notches and no tag.
• Spines and lantern unknown.

Lower Cretaceous (Lower Aptian), Europe.

Codiopsis jaccardi Cotteau, 1866, p. 778, by monotypy.

• Only the type species.

Euechinoidea, Echinacea, Arbacioida, Arbaciidae.

Subjective junior synonym of Codiopsis (Hemicodiopsis) Pomel, 1883.

Pomel (1883) used this term for Codiopsis with a pentagonal rather than circular outline. As Lambert & Mortensen quite rightly point out, this has no systematic value. The type species jaccardi diffes in no significant way from C. lorini, the type of Hemicodiopsis.

Mortensen, T. 1935. A monograph of the Echinoidea II. Bothriocidaroida, Melonechinoida, Lepidocentroida and Stirodonta. C. A. Reitzel, Copenhagen.

Pomel, A, 1883. Classification methodique et genera des echinides vivants et fossils. Alger, Paris.