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ostromia: carnivore dinosaur from the Jurassic era

Ostromia Facts

Pronunciation: os-TROE-mee-ah

Name meaning: Named after palaeontologist John Ostrom

Diet	Carnivore
Height	0.4m
Length	0.6m
Weight	400 g
Environment	Land
Era	Jurassic
Period	Late Jurassic
Type	Theropod
Location	Germany

Ostromia crassipes was a tiny theropod dinosaur that lived during the Late Jurassic period, approximately 150 million years ago, in what is now Germany. This diminutive predator represents one of the most important discoveries for understanding the early evolution of birds, as it belonged to a group of feathered dinosaurs that were very close to the origin of flight.

Despite its small size—roughly the dimensions of a pigeon—Ostromia was a formidable hunter for its scale. Like other theropods, it walked on two legs and possessed sharp claws and teeth perfectly adapted for catching small prey such as insects, early mammals, and perhaps small reptiles. Its lightweight build and long legs suggest it was an agile runner, capable of quick bursts of speed to chase down prey or escape larger predators.

What makes Ostromia particularly fascinating is its evolutionary significance. As an anchiornithid, it possessed many bird-like characteristics including feathers, though it likely could not fly in the modern sense. The discovery of Ostromia in European rocks was especially important as most similar feathered dinosaurs had previously been found in China, showing that these early bird-like dinosaurs had a much wider geographical distribution than previously thought.

The single known specimen of Ostromia provides crucial evidence about the transition from dinosaurs to birds, representing a snapshot of evolution in action during one of the most important periods in vertebrate history.

What made Ostromia distinctive?

Ostromia was characterised by its remarkably small size, being no larger than a modern pigeon, and possessed the robust leg bones that gave it its species name 'crassipes'. It had typical theropod features including sharp teeth, clawed hands, and a long tail, but in a miniaturised package.

Behaviour

Ostromia was likely an active daytime hunter that used its speed and agility to catch small prey. Its small size would have required it to hunt frequently to meet its energy needs, and it probably spent much of its time foraging through undergrowth and fallen logs for insects and small vertebrates.

Fun Facts About Ostromia

Ostromia is one of the smallest known dinosaurs, weighing only about 400 grams—roughly the same as a can of soup
The species name 'crassipes' means 'thick feet', referring to its unusually robust leg bones for such a tiny creature
Ostromia's discovery proved that feathered, bird-like dinosaurs lived across Europe as well as Asia during the Late Jurassic
Despite being found in Germany, Ostromia is more closely related to Chinese feathered dinosaurs than to other European dinosaurs
The single known Ostromia specimen is so well-preserved that scientists can study details of its bone structure and proportions

Discovery

Ostromia was first described by Christian Foth and Oliver Rauhut in 2017. The original fossils were discovered at Painten Formation, Germany.

Ostromia FAQ

What did Ostromia eat?

Ostromia was a carnivore that likely fed on small prey including insects, early mammals, small reptiles, and possibly fish. Its tiny size meant it would have targeted prey much smaller than what larger theropods hunted.

How big was Ostromia?

Ostromia was remarkably small, standing only about 40 centimetres tall at the hip and measuring roughly 60 centimetres in total length. It weighed approximately 400 grams, making it one of the smallest known dinosaurs.

When did Ostromia live?

Ostromia lived during the Late Jurassic period, approximately 157 to 145 million years ago. This was a time when the first bird-like dinosaurs were evolving and diversifying.

Where was Ostromia found?

Ostromia was discovered in the Painten Formation of Germany in 2017. This discovery was significant as it showed that feathered, bird-like dinosaurs lived in Europe during the Late Jurassic, not just in Asia.

How do you pronounce Ostromia?

Ostromia is pronounced 'os-TROE-mee-ah', with the emphasis on the second syllable. The name honours the famous American palaeontologist John Ostrom.

What does Ostromia mean?

Ostromia is named after palaeontologist John Ostrom, who made groundbreaking discoveries about the relationship between dinosaurs and birds. The species name 'crassipes' means 'thick feet' in Latin.

How fast could Ostromia run?

While no specific speed estimates exist for Ostromia, its long legs and lightweight build suggest it was capable of quick bursts of speed relative to its size, probably to catch prey and escape predators.

What type of dinosaur was Ostromia?

Ostromia was a theropod dinosaur, specifically belonging to the Anchiornithidae family. This group represents some of the most bird-like dinosaurs known, possessing feathers and many skeletal features similar to early birds.

Was Ostromia related to birds?

Yes, Ostromia was very closely related to birds. As an anchiornithid theropod, it belonged to one of the groups of feathered dinosaurs that were nearest to the origin of true birds, though Ostromia itself likely could not fly.

How many Ostromia fossils have been found?

Only one specimen of Ostromia has been discovered so far—the type specimen found in Germany's Painten Formation. However, this single specimen is remarkably well-preserved and has provided valuable insights into early bird evolution.