- Echinocystitoida by Rachel Foster
... paleontology) An order of extinct echinoderms in the subclass Perischoechinoidea.
- Palaechinoida by Madeline Vaughn
... paleontology) An extinct order of echinoderms in the subclass Perischoechinoidea with a rigid test in which the ambulacra bevel over the adjoining interambulacra.
- Bothriocidaroida by Kaitlyn Sullivan
... paleontology) An order of extinct echinoderms in the subclass Perischoechinoidea in which the ambulacra consist of two columns of plates, the interambulacra of one column, and the madreporite is placed radially.