|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||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.
|H. J. Harrington 1956||Olenellinae with well advanced genal spines. Metagenal spines absent in adult. Metagenal angle narrowly obtuse to acute. Glabella with three pairs of lateral glabellar lobes, strongly constricted at the level of the preoccipital furrow. Second (3p) furrow transglabellar, gently curved backward, not reaching the axial furrows. Preoccipital (2p) furrow curved, chevron shaped, disconnected at middle. Frontal glabellar lobe pyriform, expanded in front and encroaching over anterior border of cephalon. Occipital ring broad (sag.) and as wide (tr.) as frontal glabellar lobe. Eye lobes short, submedian (slightly anterior), reaching level of preoccipital furrow. Cephalic border raised, narrowing anteriorly.|