|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. S. Peel 2017||Smooth, slender, worm in which the longitudi- nally folded, broad, sack-like foregut narrows forward into an extensible pharynx bearing pharyngeal teeth; posterior gut longitudinally folded. Trunk parallel-sided, passing anteriorly into a slightly expanded, ovoid, proboscis with- out scalids and seemingly lacking zonation; transverse cuticular ridges, dermal sclerites and spines not present.|