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megadactylus: herbivore dinosaur from the Jurassic era

Megadactylus Facts

Pronunciation: MEG-ah-DACK-tie-lus

Name meaning: Large Finger

Diet	Herbivore
Height	1m
Length	2.5m
Weight	27 kg
Environment	Land
Era	Jurassic
Period	Early Jurassic
Type	Sauropod
Location	Northeastern United States

Megadactylus was originally named by Edward Hitchcock in 1865, but this name has since been replaced by Anchisaurus due to taxonomic complications. The name Megadactylus had already been used for another animal, making it invalid under scientific naming rules. Despite this naming confusion, the creature it described was a fascinating early sauropod that lived during the Early Jurassic period, approximately 200-192 million years ago.

This relatively small sauropod measured about 2.5 metres in length and stood roughly 1 metre tall at the hip, weighing around 27 kilograms. Unlike the massive sauropods that would later dominate the landscape, Megadactylus represented an early stage in sauropod evolution. It possessed the characteristic long neck and tail that would become hallmarks of the group, though in much more modest proportions.

As a herbivore, Megadactylus fed on the primitive plants available during the Early Jurassic, including ferns, conifers, and cycads. Its teeth were adapted for stripping vegetation rather than chewing, suggesting it swallowed plant material whole and relied on gastroliths (stomach stones) to help grind food in its digestive system. Fossils of this dinosaur have been found in the distinctive red sandstone of the Upper Portland Formation in the northeastern United States.

The taxonomic history of Megadactylus illustrates the complex nature of palaeontological classification, where early discoveries sometimes receive multiple names before the scientific community settles on the correct designation. Today, specimens originally assigned to Megadactylus are classified under the genus Anchisaurus.

What made Megadactylus distinctive?

Megadactylus was distinguished by its relatively modest size for a sauropod, long slender neck, and proportionally large hands with elongated fingers that gave it its name meaning 'large finger'. It had a small head relative to its body size and a lengthy tail that helped balance its extended neck.

Behaviour

Megadactylus likely moved in small herds through the Early Jurassic forests, using its long neck to reach vegetation at various heights. It probably spent most of its time foraging for food, requiring constant feeding to maintain its body weight, and may have migrated seasonally following food sources.

Fun Facts About Megadactylus

Megadactylus was one of the first dinosaur fossils discovered in North America, originally found in Connecticut's red sandstone quarries.
The original Megadactylus specimen was discovered in rocks that were being quarried for building stone, making it an accidental paleontological find.
Megadactylus had unusually large hands with extended fingers compared to other early sauropods, which inspired its 'large finger' name.
The red sandstone where Megadactylus was found was formed in an ancient desert environment during the Early Jurassic period.
Megadactylus represents one of the earliest known sauropods, helping scientists understand how these giants evolved from smaller ancestors.

Discovery

Megadactylus was first described by Edward Hitchcock in 1865. The original fossils were discovered at Upper Portland Formation, Connecticut, USA.

Megadactylus FAQ

What did Megadactylus eat?

Megadactylus was a herbivore that fed on Early Jurassic plants including ferns, conifers, and cycads. It used its long neck to reach vegetation at different heights and swallowed plant material whole, likely using stomach stones to help digest tough plant fibres.

How big was Megadactylus?

Megadactylus was relatively small for a sauropod, measuring about 2.5 metres in length and standing approximately 1 metre tall at the hip. It weighed around 27 kilograms, making it much smaller than the giant sauropods that evolved later.

When did Megadactylus live?

Megadactylus lived during the Early Jurassic period, approximately 200-192 million years ago. This was during the Hettangian to Sinemurian ages, when dinosaurs were beginning to diversify and grow larger.

Where was Megadactylus found?

Megadactylus fossils were discovered in the northeastern United States, specifically in the red sandstone of the Upper Portland Formation in Connecticut. These rocks were formed in ancient desert conditions during the Early Jurassic.

How do you pronounce Megadactylus?

Megadactylus is pronounced 'MEG-ah-DACK-tie-lus', with emphasis on the first syllable of each part of the name.

What does Megadactylus mean?

Megadactylus means 'large finger' in Greek, referring to the unusually large hands and elongated fingers that distinguished this early sauropod from its relatives.

How fast could Megadactylus run?

The speed of Megadactylus is unknown, but as a small early sauropod, it likely moved relatively slowly compared to other dinosaurs. Its body was built more for reaching high vegetation than for speed.

What type of dinosaur was Megadactylus?

Megadactylus was an early sauropod dinosaur, though the name is now considered a synonym of Anchisaurus. It belonged to the group of long-necked herbivorous dinosaurs, representing a primitive stage in sauropod evolution.

Was Megadactylus related to birds?

Megadactylus was not directly related to birds. As a sauropod, it belonged to a different major group of dinosaurs than the theropods that gave rise to modern birds, though all dinosaurs share common ancestry.

How many Megadactylus fossils have been found?

Only a limited number of Megadactylus specimens have been found, primarily from the original Connecticut discovery site. The fossil record for this early sauropod remains relatively sparse compared to later, more common dinosaur species.