|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Trilobita - Redlichiida - Olenellidae
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.
|A. R. Palmer and L. N. Repina 1993||Olenellidae with posterior margin of cephalon curved forward. Intergenal angle variably developed, situated slightly distal to midlength of posterior margin. Genal spine originating opposite or anterior to Si. Glabella bullet-shaped. Ocular lobes close to glabella, tips opposite or posterior to occipital furrow. Thorax with at least 17 segments; width of thoracic axis greater than width of inner parts of pleural region; third thoracic segment not modified; fifteenth segment with long axial spine. Opisthothorax not clearly differentiated. Pygidum elongate, sides convergent posteriorly, end bluntly pointed.|