|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Trilobita - Redlichiida - Nevadiidae
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||Nevadiidae with glabella distinctly tapered forward, sides slightly concave so that width is narrowest opposite L2 or S2. Preglabellar field short (sag.) or absent. Basal glabellar width about equal to width of extraocular area opposite midlength of ocular lobe. Posterior tips of ocular lobes opposite Ll. Width of interocular area more than one-fourth width of extraocular area opposite midlength of ocular lobe. Thorax of 17 to 23 segments. Pleural spines long, falcate. Opisthothorax not clearly differentiated. Pygidium small, subquad rate.|