|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
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.
|J. Ortega-Hernandez et al. 2014||arge and weakly biomineralized arthropod exhibiting the following unique combination of charac- ters: cephalon wide (tr.), with weakly defined glabellar region, genal spines inserting laterally, abaxially procurved posterior margin, and apparently no dorsal eyes or ecdy- sial sutures; 11 trunk tergites, T1–8 with edge-to-edge articulations and sickle-shaped pleural spines inserting an- terolaterally, T9–11 characterized by an abrupt change in tapering and reduction of the pleural regions into long, backward-facing pleural spines.|