|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Chondrichthyes - Xenacanthiformes - Diplodoselachidae
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.
|L. Agassiz 1843||Orthacanthus with a 18 cm long neurocranium; precerebral fossa protruding in front of the orbital region; scapulocoracoid with a flat dorsal margin (presence of a dorsal accessory cartilage not proved), and a lower extremity pointing downwards and without any accessory cartilage.|