The Echinoid Directory

• Test moderate in size, depressed in profile with ambitus low and oral surface flattened.
• Apical disc small, plating not preserved.
• Ambulacra about half interambulacral width, plating trigeminate with pore-pairs in weakly offset triads; not expanded adorally. Two small subequal tubercles to each compound plate.
• Interambulacral plates very much wider than tall; row of 3-4 subequal tubercles on ambital plates.
• Primary tubercles imperforate and non-crenulate.
• Ovate pits on horizontal sutures and medially in each zone. On ambital plates there are up to five small pits along a suture, but adapically and adorally these merge to become two large pits on either side of the central tubercle. Ambulacral zones with two pits in each half ambulacrum inside the pore zone.
• Peristome small, slightly sunken.
• Spines and lantern unknown.

Pliocene to Recent, Indonesia.

Erbechinus erbi Jeannet, in Lambert & Jeannet 1935, p. 558, by monotypy.

• E. erbi Jeannet, in Lambert & Jeannet 1935; Pliocene, Java.
• E. spectabilis (Mortensen, 1904); Recent, Kei Islands.

Camarodonta; Temnopleuroida; Temnopleuridae.

Like Opechinus in having multiple pits along horizontal interambulacral plate sutures but distinguished by having three or more subequal tubercles on ambital plates, four columns of pits in each ambulacral zone, and distinctly crenulate tuberculation.

Lambert, J. & Jeannet, A. 1935. Contribution a l'etude des Echinides tertiaires des Iles de la Sonde. Memoires de la Societe paleontologique Suisse 56, 1-62, pls 1-4.

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