|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Pteraspidomorpha - Cyathaspidida
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.
|R. H. Denison 1963||The dorsal shield has a length of 28 to 30 mm., and
a ratio of width/length of .54. The rostral edge is nearly transverse.
The preorbital processes and orbital notches are very slightly developed, and the orbits are far anterior. The ratio of postbranchial length to total length is .33-.37. The posterior edge of the dorsal shield is gently convex and lacks a median lobe. The dentine ridges are moderately coarse, 5.2-6.2 per millimeter on the dorsal shield, and 5.0-5.4 per millimeter on the ventral shield.