|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Trilobita - Holocephalinidae
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.
|C. E. Resser 1936||Cephalon alone known. Cephalon semicircular, eye- less. Glabella well defined, tapered, a little more than half the length of the head. Glabellar furrows present, the rear pair recurved, sepa- rating marginal lobes. Cheeks marked by irregular lines radiating from the dorsal furrow. Upturned rim with coarse granules ; other scattered granules on cheeks. A depression extends across the pre- glabellar area.|