|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Acanthodii (spiny fish)
It was reranked as the unranked clade Acanthodii by Gadow (1898); it was reranked as the order Acanthodii by Hay (1902); it was reranked as the subclass Acanthodii by Miles (1977).
It was assigned to Pisces by Gadow (1898); to Ichthyotomi by Hay (1902); to Gnathostomata by Dineley and Metcalf (1999); to Chordata by Sepkoski (2002); and to Teleostomi by Miles (1977) and Long (2011).
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.