|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
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. Han et al. 2017||Hemi-ellipsoidal, bilaterally symmetrical body. Integument bears chevron pattern. Ventral mouth defined by two circlets of radial folds, inner circlet with associated protuberances. Aborally and dorsally up to four nodulate rugae. Eight body openings, conical, defined by radial folds. In mid-region anteriorly directed spines. Smaller pores parallel to body cones and in posterior region, possibly housed setae.|