|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Echinoidea - Camarodonta - Toxopneustidae
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||Test small, low hemispherical; ambulacral plates trigeminate with primary tubercles in a vertical row; secondary tubercles not in regular series; interambulacra with six rows of tubercles; only one vertical row of primaries, four vertical rows of secondaries, and a row of reduced abradial secondaries; con- spicuous wide naked median space along interradial suture above ambitus and similar but narrower less conspicuous area along perradial suture.|