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MICROVENATOR

an omnivorous oviraptorosaurian theropod dinosaur from the Early Cretaceous of the U.S.A.
microvenator
Pronunciation: MIEK-ro-veh-NAY-tuhr
Meaning: Small hunter
Author/s: Ostrom (1970)
Synonyms: Megadontosaurus
First Discovery: Montana, USA
Chart Position: 176

Microvenator celer

Microvenator is the oldest known oviraptorosaur from North America, and while its name—meaning small hunter—is apt given the size of its holotype, the holotype is the only known specimen and its a juvenile. It would have packed on the pounds as it neared adulthood and may have measured some three meters from beak to tail-tip. Latest research by Junchang Lü and colleagues suggests its legs, like those of other oviraptorosaurs, wouldn't have changed much proportionately though, unlike its name, which hasn't always been what it is now.

In 1933 Barnum brown discovered a small, partial skeleton along with some oversized teeth in Montana's Cloverly Formation which he affectionately referred to as "Megadontosaurus ferox" (Fierce large-toothed lizard). Illustrations were made but the remains were never officially described nor the name published, and when John Ostrom reviewed them in 1970 he realised that the teeth, plus Brown's equally unofficial "Daptosaurus agilis" (Agile devouring lizard), belonged to Deinonychus and what was left was given a brand new name—Microvenator celer. Ostrom tentatively assigned a single tooth (YPM 5366) from the Yale Peabody Museum collections to Microvenator too, but oviraptorosaurs are mostly toothless so it probably belongs to something else.

Unofficial and therefore inverted-comma-enclosed dinosaur names are a recurring issue with critters from the Cloverly, mainly because Brown—a "hands on" fieldwork kind of guy—wasn't a big fan of paperwork and didn't get around to publishing them. He also tagged "Peltosaurus" (now known as Sauropelta) and "Tenantosaurus" (now known as Tenontosaurus), and they're infinitely better represented than Microvenator, which will remain something of an enigma until an adult specimen is found.
(Celer's small hunter) Etymology
Microvenator is derived from the Greek "mikros" (small) and the Latin "venator" (hunter). The species epithet, celer, means "swift, quick or rapid" in Latin, as in accelerate (the Latin "velox" means the same thing). The tibia-femur ratio (longer tibia than femur) suggests Microvenator was a swift runner.
Discovery
The remains of Microvenator were discovered in the Cloverly Formation at Billings, Wheatland County, Montana, USA, by Barnum Brown in 1933.
The holotype (AMNH 3041) consists of bits of the skull, a partial hip, some vertebrae and some bones from the arms, legs, hands and feet.
Estimations
Timeline:
Era: Mesozoic
Epoch: Early Cretaceous
Stage: Aptian-Albian
Age range: 118-110 mya
Stats:
Est. max. length: 3 meters
Est. max. hip height: 1 meters
Est. max. weight: 50 Kg
Diet: Omnivore
References
• Ostrom, John H. (1970) "Stratigraphy and paleontology of the Cloverly Formation (Lower Cretaceous) of the Bighorn Basin area, Wyoming and Montana".
The Peabody Museum of Natural History, Yale University, Bulletin 35.
• Mackovicky, Peter J. and Sues, Hans-Dieter (1998) "Anatomy and phylogenetic relationships of the Theropod Dinosaur Microvenator celer from the Lower Cretaceous of Montana".
American Museum novitates; no. 3240.
• Varricchio, D. J. (2001) "Late Cretaceous oviraptorosaur (Theropoda) dinosaurs from Montana" in Tanke and Carpenter "Mesozoic Vertebrate Life". Indiana University Press.
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To cite this page:
Atkinson, L. "MICROVENATOR :: from DinoChecker's dinosaur archive".
›. Web access: 16th Dec 2017.
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