|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Edrioasteroidea - Edrioblastoida - Steganoblastidae
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.
|J. Sprinkle 1982||Echinozoans with bud-shaped theca having 5 basals, 5 radials, 5 parabolic deltoids, numerous interray plates below deltoids, and 5 small orals. Ambulacra elongate and U-shaped, extending down theca from central mouth on summit, bearing rows of pores for tube feet from closed water vascular system but no other plated appendages. Each ambulacrum formed by elongate limbs of two deltoid plates sutured together. Anus on side of theca below posterior deltoid, slit- or porelike hydropore in posterior deltoid with 1 or more small gonopores nearby. Plates ornamented with small pits, with deep grooves crossing sutures but not penetrating to thecal interior. Stem divided into pentameres, tapering distally, probably short.|