|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Rhynchonellata - Atrypida - Atrypinidae
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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.
|L.E. Popov et al. 1999 (Pectenospirinae)||Coarsely costate Protozygidae with a sharp ventral sulcus and dorsal median fold; anterior commissure parasulcate; spiralia planispiral with incomplete jugum located mediodorsally.|