The Echinoid Directory

 Camarodonta with:

• apical disc hemicyclic; periproct angular to accomodate suranal plate;
• ambulacra trigeminate or polygeminate, with glyphocyphid style compounding (all elements extending from adradial to perradial suture, primary tubercle overlapping two of the three elements, the lower of the two the larger);
• primary tubercles in ambulacral and interambulacral zones of similar size; imperforate and crenulate;
• secondaries projecting from surface; adoral regions of plate sunken or with wedge-shaped pits;
• peristome larger than apical disc; buccal notches obsolete.

Cretaceous (Cenomanian to Maastrichtian) Europe, North America, central Asia.

Distinguished from other sculpted temnopleurids by its hemicyclic apical disc and the lack of true echinoid-style ambulacral plate compounding.

Lewis, D. N. 1986. The Cretaceous echinoid Boletechinus, with notes on the phylogeny of the Glyphocyphidae and Temnopleuridae. Bulletins of the British Museum (Natural History), Geology Series 40, 59-90.