The Echinoid Directory

 Cidarids with:

• interambulacra with single large primary tubercle that is perforate and primarily non-crenulate (traces of crenulation may be present adapically, on adapical side of platform)
• no naked furrows or pits developed interradially or perradially
• scrobicular tubercles differentiated from extrascrobicular granules.

?Upper Triassic, Peru; Lower Cretaceous to Recent, worldwide.

There are few, if any, synapomorphies distinguishing this subfamily. In the following key the Triassic genus Triassicidaris is omitted because of an absence of information on its spines and apical disc plating.

Mortensen, T. 1928. A Monograph of the Echinoidea. I. Cidaroidea. C. A. Reitzel, Copenhagen, 551 pp.