Claim: Aldrovandia gracilis a genus of Aldrovandia in the Halosauridae family, within the Notacanthiformes order, and under the Actinopterygii class.
Evidence: Aldrovandia Genus: Halosauridae Family: Notacanthiformes Order: Actinopterygii Class: 
Aldrovandia gracilis, also known as the gracile halosaur, is a species of fish in the family Halosauridae. Class: Actinopterygii Notacanthiformes Order: Genus: Aldrovandia