Minjinia turgenensis is a species of placoderm from the Devonian of Mongolia.

It is known from a single specimen preserving part of the skull, including remains of endochondral bone, which indicates that a mineralised endoskeleton evolved before the split between bony and cartilaginous fish, and that it was lost in the latter group.

[1] In the phylogenetic analysis ran by Brazeau et al., M. turgenensis was found as the sister taxon of a clade formed by Entelognathus, Ramirosuarezia, Janusiscus and the crown gnathostomes.

A cladogram simplified from their analysis is shown below:[1] Galeaspida Osteostraci Antiarchi Rhenanida Petalichthyida Ptyctodontida Arthrodira Minjinia Entelognathus Ramirosuarezia Janusiscus Chondrichthyes Osteichthyes

This article about a placoderm is a stub.