[2] Several other non-teleostomorph teleosteans existed throughout the Mesozoic, although not as dominant as the two main clades in the group.

Shared morphological features of this group include a autosphenotic bone lacking a dermal component, the lack of a canal bearing part of the antorbital bone, the lack of vertebral centra fused into the occipital condyle in adult individuals, and each hypural (caudal fin support) being articulated with caudal rays.

Cladogram of Teleosteomorpha after Sferco et al. 2021:[4]Holostei Pachycormiformes Aspidorhynchiformes Mesturus Pholidophoridae Siemensichythys Dorsetichthys Eurycormus Leptolepidae Luisiellidae Tharsis dubius Varasichthyidae Ascalabos Ichthyodectiformes Teleostei crown group (including Crossognathiformes)

[5]Pachycormidae Aspidorhynchidae Archaeomaenidae Pholidophoridae Prohalecites Eurycormus Ankylophoridae Ichthyokentema Dorsetichthys Leptolepis Ascalaboidae Varasichthyidae Crown group Teleostei

Where applicable, taxonomic order is based on the 5th edition of Fishes of the World:[2]