Claim: Some studies have found Ambiortus to be closely related to the Ichthyornithes, but most analyses have found it to be either an unresolved member of the Ornithurae.
Evidence: Some studies have found it to be closely related to the Ichthyornithes, a relatively advanced group closely related to modern birds. However, most analyses have found it to be either an unresolved member of the Ornithurae, or a more primitive member of Ornithuromorpha.