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Erlikosaurus andrewsi

By Ripley Cook

Etymology: Demon-King Reptile

First Described By: Perle, 1980

Classification: Dinosauromorpha, Dinosauriformes, Dracohors, Dinosauria, Saurischia, Eusaurischia, Theropoda, Neotheropoda, Averostra, Tetanurae, Orionides, Avetheropoda, Coelurosauria, Tyrannoraptora, Maniraptoromorpha, Maniraptoriformes, Maniraptora, Therizinosauria, THerizinosauridea, Therizinosauridae

Status: Extinct

Time and Place: About 90 million years ago, in the Turonian of the Late Cretaceous

Erlikosaurus is found in the Bayan Shireh Formation in Dornogovi, Mongolia

Physical Description: Erlikosaurus was a kind of Therizinosaur, the very bulky feathered dinosaurs with long, pointed claws extending from their hands. They’re weird in other ways, too - they have backward-facing hip bones like those of birds and Ornithischians, and giant pot-bellies to let them digest large amounts of plant material. As such, they stood up almost as vertical as people do - rather than horizontally like… all other dinosaurs. Erlikosaurus had a long neck, a squat body, short legs and a short tail; while its arms were normal length, it also had very long curved claws, like other therizinosaurs. It had very large and long nostrils for a therizinosaur, and a very high number of teeth compared to its relatives. Interestingly enough, therizinosaurs like Erlikosaurus also had swollen, pneumatized braincases, which allowed them to be lighter weight and potentially cool off quicker. Erlikosaurus also, unlike other Therizinosaurs, ahd long and slender claws on its feet. It may have been around six meters long. Like other therizinosaurs, it would have been covered with feathers all over its body, and potentially had very primitive long feathers on its arms like wings.

Diet: Erlikosaurus, like other therizinosaurs, was an herbivore.

By Jack Wood

Behavior: Erlikosaurus is a fascinating dinosaur behavior-wise because we actually have a decent number of scans of its brain, which may teach us aspects of its behavior. Erlikosaurus had a very well developed sense of smell, hearing, and balanced, which means that it retained a lot of the traits of carnivorous theropods - and probably used them to its advantage as an herbivore. It also probably was able to sense oncoming predators well and have complex social behavior. The range of its mouth, however, was narrower than that of its close carnivorous relatives - indicating that herbivorous dinosaurs, much like herbivorous mammals, had smaller mouth gapes than carnivores. With complicated social behavior, long claws, and good senses, Erlikosaurus would have been incredibly paranoid - and dangerous - ready to fend off anyone that would have threatened their family groups with those long scythe claws. As a social dinosaur, Erlikosaurus would have probably taken care of its young, and been warm blooded. The scythe claws, when not used in defense, would have been helpful in gathering plants down from the trees, much like with sloths today.

Ecosystem: The Bayan Shireh Environment was one of many such ecosystems found in the mid to late Cretaceous, showcasing a wide variety of animals that were almost - but not quite - like their latest Cretaceous counterparts. Here was a braided river environment, going through season wet and dry seasons as the mud and sand interchanged from one another leading to a variety of rock types and depositional environments. There were many water plants and flowering plants lining the shores, giving it a lush and green feel for at least part of the year - and giving Erlikosaurus something to eat! There were also fish, molluscs, the mammal Tsagandelta, and turtles making frequent appearances in the environment. Unnamed crocodylian relatives and Azhdarchid pterosaurs were present, but most of the charismatic animals present were other dinosaurs. Erlikosaurus wasn’t the only Therizinosaur, and also lived with Segnosaurus and Enigmosaurus. The very large, weird, and lopsided sauropod Erketu graced the treetops, slowly foraging on food, while the much smaller Ornithomimosaur Garudimimus scurried about between them all. Ankylosaurs went absolutely wild here, represented by Talarurus, Maleevus, and Tsagantegia. There were two small bipedal Ceratopsians, Graciliceratops and Microceratus, and the early hadrosauroid Gobihadros. There was also a mystery dinosaur, Amtosaurus, which has no affinity beyond “Ornithischian” at this point in time. As for predators, there was the very large raptor Achillobator and the small tyrannosaur Alectrosaurus - both similar in size to one another, and both giant dangers to the roaming herds of Erlikosaurus!

By Scott Reid

Other: Erlikosaurus was a very advanced therizinosaur, similar to later members of the group like Therizinosaurus rather than Early Cretaceous varieties. As such, it shows that the more classic therizinosaur body shape was around by the “mid” Cretaceous. In addition, it may or may not be the same animal as the other therizinosaurs found in its home - more research is needed to determine as such.

~ By Meig Dickson

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