|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Pteraspidomorphi - Ariaspididae
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 is relatively broad and weakly vaulted. There is no median process on the rostral margin, but the preorbital processes are strongly developed. Narrow lateral laminae extend from the orbits to the branchial openings and are separated fromtherestoftheshieldbysharpdownwardangulations. There are no postbranchial lobes, and the postero-lateral corners of the shield are small points. The posterior edge of the dorsal shield is nearly transverse except for the incorporation of a small, median, projecting scale. No separate epitega are distinguishable.|