The Echinoid Directory

• Test small, low domal in profile.
• Apical disc moderately large, plating dicyclic with small projecting ocular plates. Periproct large, subcircular, with small but distinct suranal. A ring of tubercles on the genital plates surrounds the periproct.
• Ambulacral zones straight, a little more than half the interambulacral width. Plating trigeminate, compound in echinid style. Pore-pairs weakly offset in triads, and hardly more crowded adorally. Single primary tubercle to each compound plate adjacent to pore zone, plus scattered miliaries.
• Interambulacral plates with central primary tubercle and rather sparse secondaries and granules; the secondaries with a radial epistroma.
• No pits or other epistromal ornament.
• Primary tubercles imperforate and distinctly crenulate and with an incised (indented) areole.
• Peristome with very feeble buccal notches.
• Spines short and without cortex.
• Perignathic girdle with auricles fused above the perradius.

Upper Eocene to Recent; Australia, Indonesia.

Asterechinus elegans Mortensen, 1942, p. 288, by original designation.

• A. elegans Mortensen, 1942; Recent, Indonesia (Admiralty Islands).
• A. nudus (Philip, 1969); Upper Eocene, Australia.

Euechinoidea; Camarodonta; Temnopleuroida; Trigonocidaridae.

 

Mortensen, T. 1943. A monograph of the Echinoidea Part III.2, Camarodonta 1. C. A. Reitzel, Copenhagen.