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orthomerus: herbivore dinosaur from the Cretaceous era

Orthomerus Facts

Pronunciation: OR-tho-MEE-rus

Name meaning: Straight thigh

Diet	Herbivore
Height	2m
Length	6m
Weight	2 tonnes
Environment	Land
Era	Cretaceous
Period	Late Cretaceous
Type	Ornithopod
Location	Netherlands

Orthomerus was an ornithopod dinosaur that lived during the Late Cretaceous period, approximately 72.2 million years ago. This dinosaur is known from fragmentary remains discovered in the Netherlands, making it one of the few dinosaurs found in this region of Europe. Unfortunately, the fossil evidence for Orthomerus is so limited that palaeontologists consider it a dubious genus, meaning there isn't enough material to properly define what made it unique.

What we do know suggests that Orthomerus was likely a duck-billed dinosaur, belonging to the same family as the famous Parasaurolophus and Edmontosaurus. As an ornithopod, it would have been a plant-eater with a sophisticated dental system designed for processing tough vegetation. The name Orthomerus means 'straight thigh', referring to characteristics observed in the limited leg bone fragments that were found.

The fragmentary nature of Orthomerus fossils has led to considerable confusion in the past. Early palaeontologists sometimes mixed up Orthomerus remains with those of Telmatosaurus, another European duck-billed dinosaur that is much better known from more complete fossils. This confusion highlights the challenges faced by scientists when working with incomplete fossil material.

Today, Orthomerus remains an enigmatic dinosaur. Whilst it provides evidence that ornithopods lived in what is now the Netherlands during the Late Cretaceous, we know frustratingly little about its appearance, behaviour, or how it differed from its better-known relatives.

What made Orthomerus distinctive?

Due to the fragmentary nature of the fossils, no clear distinguishing features can be identified for Orthomerus. The remains consist primarily of leg bone fragments that led to its name meaning 'straight thigh'.

Behaviour

Very little can be determined about Orthomerus behaviour due to the limited fossil evidence. As an ornithopod, it likely lived in herds and spent much of its time foraging for plant material in the Late Cretaceous forests of Europe.

Fun Facts About Orthomerus

Orthomerus is one of the few dinosaurs known from the Netherlands, making it a rare European discovery.
The fossils of Orthomerus were so fragmentary that they were often confused with remains of the better-known Telmatosaurus.
Orthomerus lived on what would have been a series of islands in the Late Cretaceous European archipelago.
The name Orthomerus was given based on just a few leg bone fragments found in 1883.
Despite being discovered in the 19th century, Orthomerus remains one of the most poorly understood duck-billed dinosaurs.

Discovery

Orthomerus was first described by Seeley in 1883. The original fossils were discovered at Maastricht Formation, Netherlands.

Orthomerus FAQ

What did Orthomerus eat?

Orthomerus was a herbivore that fed on the plants available in Late Cretaceous Europe. As an ornithopod, it would have had a sophisticated dental system for processing tough vegetation like ferns, cycads, and early flowering plants.

How big was Orthomerus?

Based on limited fossil evidence, Orthomerus is estimated to have been around 6 metres long, 2 metres tall at the hip, and weighed approximately 2 tonnes. However, these estimates are very uncertain due to the fragmentary nature of the remains.

When did Orthomerus live?

Orthomerus lived during the Late Cretaceous period, specifically around 72.2 million years ago. This was near the end of the age of dinosaurs, just before the mass extinction event.

Where was Orthomerus found?

Orthomerus fossils were discovered in the Netherlands, specifically in the Maastricht Formation. This makes it one of the few dinosaurs known from this region of Europe.

How do you pronounce Orthomerus?

Orthomerus is pronounced 'OR-tho-MEE-rus', with the emphasis on the middle syllable 'MEE'.

What does Orthomerus mean?

Orthomerus means 'straight thigh' in Greek. This name refers to characteristics observed in the leg bone fragments that were found, which were among the few fossils available to early palaeontologists.

How fast could Orthomerus run?

The speed of Orthomerus is unknown due to the fragmentary nature of the fossil evidence. Without more complete leg bones and body proportions, it's impossible to estimate how fast this dinosaur could move.

What type of dinosaur was Orthomerus?

Orthomerus was an ornithopod dinosaur, specifically thought to be a member of the duck-billed dinosaur family. However, the fossil evidence is so limited that its exact classification remains uncertain.

Was Orthomerus related to birds?

Orthomerus was an ornithopod, which belonged to a different major group of dinosaurs than the theropods that gave rise to birds. However, like all dinosaurs, it was part of the broader reptilian family tree that includes modern birds.

How many Orthomerus fossils have been found?

Very few Orthomerus fossils have been found - primarily just fragmentary leg bones discovered in the 1880s. The scarcity of fossil material is why palaeontologists consider it a dubious genus today.