Dinosaurs get all the glory. But aetosaurs, a heavily armored cousin of modern crocodiles, ruled the world before dinosaurs did. These tanks of the Triassic came in a variety of shapes and sizes before going extinct around 200 million years ago. Today, their fossils are found on every continent except Antarctica and Australia.
Scientists use the bony plates that make up aetosaur armor to identify different species and usually don't have many fossil skeletons to work with. But a new study led by researchers at The University of Texas at Austin centers on an aetosaur suit of armor that has most of its major parts intact.
The suit—called a carapace—is about 70% complete and covers each major region of the body.
The paper is published in The Anatomical Record.
“We have elements from the back of the neck and shoulder region all the way to the tip of the tail,” said William Reyes, a doctoral student at the UT Jackson School of Geosciences who led the research. “Usually, you find very limited material.”
Reyes and his collaborators used the armor to identify the specimen as a new aetosaur species—which they named Garzapelta muelleri. The name “Garza” recognizes Garza County in northwest Texas, where the aetosaur was found, and “pelta” is Latin for shield, a nod to aetosaur's heavily fortified body. The species name “muelleri” honors the paleontologist who originally discovered it, Bill Mueller.
Garzapelta lived about 215 million years ago and resembled a modern American crocodile—but with much more armor.
Dinosaurs get all the glory. But aetosaurs, a heavily armored cousin of modern crocodiles, ruled the world before dinosaurs did. These tanks of the Triassic came in a variety of shapes and sizes before going extinct around 200 million years ago. Today, their fossils are found on every continent except Antarctica and Australia.
Once the researchers determined that the spikes evolved independently, they were able to work out where Garzapelta fit best among other aetosaur species. Nevertheless, Reyes said the research shows how convergent evolution can complicate things.
“Convergence of the osteoderms across distantly related aetosaurs has been noted before, but the carapace of Garzapelta muelleri is the best example of it and shows to what extent it can happen and the problems it causes in our phylogenetic analyses,” Reyes said.
Garzapelta is part of the Texas Tech University fossil collections. It spent most of the past 30 years on a shelf before Reyes encountered it during a visit. Bill Parker, an aetosaur expert and park paleontologist at Petrified Forest National Park who was not part of the research, said that university and museum collections are a critical part of making this type of research possible.
“These specimens weren't just dug in the field yesterday,” he said. “They've been sitting in the museum for decades and it just takes someone like Will to come along and finally decide to study them and make them come to life.”
In addition to different species having different armor, it's possible that an animal's age or sex could also affect armor appearance. Reyes is currently exploring these questions by studying aetosaur fossils in the Jackson School's collection, most of which were found during the 1940s as part of excavations done by the Works Progress Administration.
The study co-authors are Jeffrey Martz, an associate professor at the University of Houston-Downtown, and Bryan Small, a research associate at the Museum of Texas Tech University.