[5] Andreolepis was capable of shedding its teeth by basal resorption, which is considered a rather primitive mode of tooth replacement.

Scales, platelets and a spine from the Central Urals in Russia have thereafter been assigned to a new species, A. petri, due to differences in fossil morphology.

Examples of encountered vertebrate genera are Gomphonchus, Nostolepis, Archegonaspis, Thyestes, Paralogania, Phlebolepis and Thelodus.

[1] The squamation pattern has been divided into ten morphotypes, each presumably covering a distinct section of the body.

The lack of teeth and the recognition of initial denticle organisation suggested a basal phylogenetic position within the osteichthyes.

[12] Recently it was shown that A. hedei did have functional teeth that were shed by basal-resorption, something that was overlooked during previous research efforts due to methodological limitations.

The presence of a primitive form of tooth development in the most basal osteichthyans sheds light on the manner by which this has evolved.

Moving up in the phylogenetic tree, more derived extinct and extant species show a shift of enamel-containing structures from the scales, to the dermal plate and eventually the teeth, with enamel lost in dermal teeth-like structures and in some cases even in the teeth of the most derived groups of tetrapods and teleosts.