|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Echinoidea - Clypeasteroida - Echinarachniidae
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 very small with subpentagonal outline; width greater than length; both peristome and apical system anteriorly eccentric about 7 percent; periproct supramarginal, situated above ambitus about 2-3 periproct diameters, between third and fourth pair of coronal plates; anterior petal open, inflated distally, distinctly flared; anterior paired petals subparallel, pos- terior paired petals narrowly parallel; bivium angle 62?; smallest adult size observed 5.6 mm (anterior-posterior) with four gono- pores; largest specimen about 14 mm.|