|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||Bristohinae with posterior margin of cephalon strongly and evenly curved back distally; genal spines short, at posterolateral corners, situated well behind level of occipital ring. Intergenal spine absent. Preglabellar field short. Width of interocular area about half width of glabella at L2. Posterior tips of ocular lobes opposite Ll.|