Glyptodontopelta—"Glyptodon shield"—was so named because its armour resembled that of the VW Beetle-sized, armadillo-like mammal known as Glyptodon. Unfortunately, three bits of flat armour-plate represent the entirety of its fossils, which isn't a particularly strong foundation on which to build an entirely new dinosaur, and many experts have been suspicious of its validity from the jump.
One worker who believed Glyptodontopelta to be a distinct and diagnostic dinosaur is Tracey Ford though this is not surprising, because he named it. He even raised a new family — Stegopeltinae — to house it along with Aletopelta and Stegopelta, the latter of which Wendell Williston had compared to both Stegosaurus and Glyptodon in 1905. But still most experts remained unswayed.
Although found to be dubious in a review of ankylosaurs in 2004, Michael Burns revisited Glyptodontopelta in 2008 and confirmed that the surface texture of its armour was indeed unique for a dinosaur. But he also rejected Stegopeltinae, tagged Glyptodontopelta a nodosaurid, and had a sneaking suspicion that it may own the remains that Ford had assigned to Edmontonia australis from the older Kirtland Formation, also in 2000.
The holotype (USNM 8610) consists of three pieces of armour plate.