|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Trilobita - Phacopida - Cheiruridae
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.
|W. A. Hessin 1988||A genus of Cheirurinae with moderately and nearly parallel-sided glabella which possesses three short glabellar furrows; width across occipital ring slightly than one-fourth width of cephalon; occipital ring broad, one-fourth length of glabella; glabella appears smooth ed eye, but has prosopon of very fine granules and typically pairs of low, rounded tubercles on medial portion of (often fourth pair and one of third pair absent); eye small, vated and positioned on mid-point of cheek opposite 2s furrow or 2p lobe; rostral plate possesses a pair of faint tubercles; an- terior border very narrow, almost indistinguishable from an- terior lobe of glabella; genal spines moderately long and extend back to opposite fourth or fifth thoracic segment; pygidium triangular in outline, excluding slender anterior spines which are almost as long as length of thorax; two pairs of posterior spines present, but very short|