Macrurosaurus Facts
Pronunciation: mack-roo-roe-SORE-us
Name meaning: Long-tailed lizard
| Diet | Herbivore |
| Height | 3m |
| Length | 15m |
| Weight | 12 tonnes |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Sauropod |
| Location | England |
Macrurosaurus was a sauropod dinosaur that lived during the Late Cretaceous period in what is now England, approximately 85.7 to 83.6 million years ago. As a member of the titanosauriforms, it belonged to one of the most successful groups of long-necked dinosaurs that dominated many parts of the world during the Cretaceous period.
Like other sauropods, Macrurosaurus was a massive, quadrupedal herbivore with a long neck and tail. Based on the limited fossil evidence, scientists estimate it reached lengths of around 15 metres and stood approximately 3 metres tall at the hip. Its body would have been supported by four pillar-like legs, with the long neck allowing it to browse on vegetation at various heights that other herbivores couldn't reach.
As a plant-eater, Macrurosaurus would have used its long neck to strip leaves, ferns, and conifers from trees and tall plants. Like other sauropods, it likely swallowed stones called gastroliths to help grind up tough plant material in its stomach, since its small teeth were designed for stripping rather than chewing vegetation.
Unfortunately, Macrurosaurus is known from very fragmentary remains, consisting mainly of vertebrae discovered in the Cambridge Greensand formation. This limited fossil evidence makes it difficult for palaeontologists to determine its exact relationships to other sauropods, leading to its classification as a nomen dubium - a name of doubtful validity.
What made Macrurosaurus distinctive?
Macrurosaurus is primarily known from vertebrae that suggested it had an unusually long tail relative to its body size, which gave the dinosaur its name meaning 'long-tailed lizard'. However, the fragmentary nature of the remains makes it difficult to identify other distinctive features with certainty.
Behaviour
As a sauropod, Macrurosaurus likely lived in herds and spent most of its time feeding on vegetation using its long neck to reach high branches. Like other large herbivores, it would have needed to consume enormous quantities of plant material daily to sustain its massive body.
Discovery
Macrurosaurus was first described by Harry Govier Seeley in 1876. The original fossils were discovered at Cambridge Greensand, Cambridgeshire, England.
Macrurosaurus FAQ
What did Macrurosaurus eat?
Macrurosaurus was a herbivore that fed on plants including ferns, conifers, and other vegetation available during the
Late Cretaceous period. It would have used its long neck to browse on leaves and branches at different heights, swallowing plant material whole since its teeth were designed for stripping rather than chewing.
How big was Macrurosaurus?
Macrurosaurus is estimated to have been around 15 metres long and stood approximately 3 metres tall at the hip, weighing roughly 12 tonnes. However, these measurements are uncertain due to the fragmentary nature of the fossil remains, which consist mainly of vertebrae.
When did Macrurosaurus live?
Macrurosaurus lived during the
Late Cretaceous period, specifically between 85.7 and 83.6 million years ago. This was towards the end of the Age of Dinosaurs, when sauropods like Macrurosaurus shared the Earth with famous predators like
Tyrannosaurus rex.
Where was Macrurosaurus found?
Macrurosaurus fossils were discovered in England, specifically in the Cambridge Greensand formation in Cambridgeshire. This makes it one of the few sauropod dinosaurs known from British fossil deposits, though similar titanosauriforms have been found across Europe and other continents.
How do you pronounce Macrurosaurus?
Macrurosaurus is pronounced 'mack-roo-roe-SORE-us', with the emphasis on the final syllable. The name comes from Greek words meaning 'long-tailed lizard', referring to the apparently elongated tail suggested by the fossil vertebrae.
What does Macrurosaurus mean?
Macrurosaurus means 'long-tailed lizard' in Greek. The name was chosen because the tail vertebrae found suggested this dinosaur had a particularly long tail compared to other sauropods known when it was first described in 1876.
How fast could Macrurosaurus run?
Like other large sauropods, Macrurosaurus was not built for speed. Its massive size and pillar-like legs meant it likely moved at a walking pace, probably no faster than a few kilometres per hour. Its survival strategy relied on size rather than speed.
What type of dinosaur was Macrurosaurus?
Macrurosaurus was a sauropod dinosaur, specifically classified as a titanosauriform. However, it's considered a nomen dubium due to the fragmentary nature of its remains, making its exact relationships to other sauropods uncertain.
Was Macrurosaurus related to birds?
As a sauropod, Macrurosaurus was only distantly related to birds. Sauropods belonged to the saurischian dinosaurs, the same major group that gave rise to birds, but birds evolved from theropod dinosaurs rather than the long-necked sauropod lineage.
How many Macrurosaurus fossils have been found?
Very few Macrurosaurus fossils have been discovered - mainly vertebrae from the original 1870s finds in the Cambridge Greensand. The scarcity of fossil material is why it's considered a nomen dubium, as there isn't enough evidence to clearly distinguish it from other sauropods.
