|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Echinoidea - Temnopleuroida
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|R. A. Linder et al. 1988||est small, low hemispherical; zygopores arcuate within trigeminous echinoid-type ambulacra; test not sculp- tured; ambulacral and interambulacral primary tubercles ar- ranged in two irregular vertical series, crenulated and imper- forate; secondary interambulacral tubercles crenulate, arranged in irregular vertical|