The Echinoid Directory

Cryptechinus Philip, 1969, p. 236

Diagnostic Features	Test low domal Apical disc small, dicyclic. Periproct ovate; ocular plates projecting Ambulacral plating trigeminate; plate compounding in echinid style. Pore-pairs arranged in single series throughout. One primary tubercle to each compound plate, adradial in position. Perradial zone relatively wide and with secondary tubvercles and granules. Interambulacral plates with small central primary tubercle. remainder of plate eith scattered secondaries and miliaries. Often a radiating sculpture surrounds the primary tubercle. Primary tubercles imperforate and strongly crenulate. Peristomial small with small but distinct buccal notches. Auricles of perignathic girdle slender; generally touch perrradially but not fused. Spines unknown.
Distribution	Miocene, South Australia.
Name gender	masculine
Type	Psammechinus (?) humilior Bittner, 1892, p. 337, by original designation.
Species Included	Only the type species.
Classification and/or Status	Euechinoidea; Camarodonta; Temnopleuroida; Trigonocidaridae Monotypic.
Remarks	Distinguished from Ortholophus by its more strongly crenulate tubercles, unfused auricles and sharper buccal notches. Very like Asterechinus but distinguished by its ornamentation of anastomosing ridges. Philip, G. M. 1969. The Tertiary echinoids of South-Eastern Australia IV. Camarodonta (2). Royal Society of Victoria Proceedings 82, 233-275, pls 3-16.