|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Trilobita - Phacopida - Calymenidae
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. G. Tillman 1960||Papillate calymenid trilobite characterized by great but variable development of U-shaped or spatulate process from anterior border, very deep preglabellar furrow, large rostrum with open V-shaped an- terior edge and unknown posterior edge, distinct flattening of tops of axial and pleural thoracic lobes, twelve (?) or thirteen thoracic segments, pygidium with five axial rings and four pleural furrows, the latter extend- ing only two-thirds of way to ventral edge of pleurae, very faint interpleural furrows on inner parts of pleurae only|