Animantarx (/ænɪˈmæntɑːrks/ ann-i-MAN-tarks; meaning 'living citadel') is a genus of nodosaurid ankylosaurian dinosaur from the Early and Late Cretaceous of western North America.

The most recent cladistic analysis of ankylosaur phylogeny does not include Animantarx, although the authors recognize the genus as Nodosauridae incertae sedis because of its rounded supraorbital protrusions and a "knoblike" acromion on the scapula.

At least 80 other vertebrate species are known from the Mussentuchit, including fish, frogs, lizards, snakes, crocodilians, dinosaurs, birds, and mammals, although not all are complete enough to name.

[10] While there is still a lot of exploration left to be done, this division of nodosaur species corresponds with that of other dinosaur groups and provides support for the hypothesis of three separate faunas in the Cedar Mountain Formation.

The Mussentuchit fauna includes many taxa which may be of Asian origin and suggests a dispersal event may have occurred from Asia into North America around this time.