|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Echinoidea - Stomopneustoida - Stomechinidae
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||Medium sized, tubercles noncrenulate; ambu- lacral plates diadematoid, primary tubercles on every third plate, in vertical rows; large secondary tubercles on ambulacral plates without large primary tubercles, in vertical row; on interam- bulacral plates two larger secondary tubercles in vertical row adradial to primary tubercles; interambulacra with single ver- tical row of primary tubercles and single vertical rows of abradial and adradial secondary tubercles.|