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Species Profile

Supersaurus

Supersaurus vivianae

Jurassic length, Morrison legend
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Supersaurus Distribution

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Endemic Species
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Size Comparison

Human 5'8"
Supersaurus 22 ft 12 in

Supersaurus is 4.1x the height of an average human.

supersaurus

At a Glance

Wild Species
Diet Herbivore
Activity Cathemeral
Weight 50000 lbs
Status Not Evaluated
Did You Know?

Supersaurus vivianae was named by James A. Jensen in 1985 from the Morrison Formation (western North America).

Scientific Classification

Supersaurus is a genus of very large long-necked sauropod dinosaur (a diplodocid) known from the Late Jurassic Morrison Formation of western North America. It is often cited among the longest sauropods, based on very large vertebrae and limb elements attributed to the taxon.

Kingdom
Animalia
Phylum
Chordata
Class
Reptilia
Order
Saurischia
Family
Diplodocidae
Genus
Supersaurus
Species
vivianae

Distinguishing Features

  • Diplodocid sauropod body plan: very long neck and tail, relatively small head
  • Extremely large vertebral and limb elements in referred material, contributing to estimates of exceptional body length
  • Quadrupedal, columnar limbs typical of sauropod dinosaurs

Physical Measurements

Height
22 ft 12 in (19 ft 8 in – 26 ft 3 in)
Length
111 ft 7 in (98 ft 5 in – 111 ft 7 in)
Weight
44.1 tons (33.1 tons – 55.1 tons)
Tail Length
49 ft 3 in (42 ft 8 in – 59 ft 1 in)
Top Speed
12 mph
running

Appearance

Primary Colors
Secondary Colors
Skin Type Pebbly, non-overlapping scales inferred from sauropod skin impressions; no Supersaurus-specific integument fossils known.
Distinctive Features
  • Late Jurassic (Kimmeridgian-Tithonian) Morrison Formation diplodocid; reconstruction based on fragmentary remains from Dry Mesa Quarry (Colorado).
  • Exceptionally elongate neck inferred from very large cervical vertebrae attributed to Supersaurus; among the longest-bodied diplodocids in some reconstructions, but size remains uncertain due to referred material.
  • Large shoulder girdle elements (notably an enormous scapulocoracoid often cited around ~2.4-2.7 m long) have driven "super-sized" estimates; exact total length/mass cannot be resolved from current material.
  • Overall diplodocid build expected: small head, long cervical series, long whip-like tail, relatively slender limb columns compared with Apatosaurus.
  • Likely herbivorous high-to-mid browser by analogy with Diplodocus/Barosaurus; specific feeding height and behavior are not directly measurable from known Supersaurus fossils.
  • Comparative context: more gracile than Apatosaurus, more extremely elongate-necked in some interpretations than Diplodocus, and often compared with Barosaurus for neck proportions-yet referral/association of bones is a key uncertainty.

Did You Know?

Supersaurus vivianae was named by James A. Jensen in 1985 from the Morrison Formation (western North America).

It's a diplodocid-closer in build to Diplodocus and Barosaurus than to stockier macronarians like Brachiosaurus.

A famous attributed neck vertebra is ~1.38 m long (often cited as among the longest sauropod cervicals), helping drive its "super-long" reputation.

Most of Supersaurus is known from partial remains (not a complete skeleton), so whole-body size must be reconstructed by comparison with better-known diplodocids.

Length estimates commonly cluster around ~30-35 m, but values depend heavily on which isolated bones are confidently referred to Supersaurus and on scaling assumptions.

Its fossils come from the Morrison Formation-one of the world's richest Late Jurassic dinosaur ecosystems, also home to Allosaurus, Stegosaurus, Diplodocus, and Apatosaurus.

Unique Adaptations

  • Extreme skeletal pneumaticity (air-filled spaces) typical of diplodocoids: reduces mass of the neck and trunk while maintaining large body size (inferred for Supersaurus from its diplodocid anatomy).
  • Elongated cervical series and vertebral architecture (inferred from referred giant cervicals): supports an exceptionally long neck with strong internal bracing (laminae) seen across diplodocids.
  • Columnar limbs with large articular surfaces: sauropod weight-bearing design enabling gigantic body mass while walking on land (general sauropod adaptation; preserved limb elements attributed to Supersaurus support this).
  • Small, peg-like teeth (diplodocid trait): suited to nipping/stripping vegetation rather than processing food orally.

Interesting Behaviors

  • High-volume, low-bite-force feeding (inferred): like other diplodocids, it likely stripped foliage rather than chewing, relying on gut fermentation; direct stomach-content evidence is not known for Supersaurus specifically.
  • Neck-driven feeding envelope (inferred): a very long neck would have expanded feeding range without constant whole-body movement, a common diplodocid strategy discussed in sauropod functional studies.
  • Herding/aggregation (uncertain): trackways and bonebeds show some sauropods moved in groups, but there is no definitive, Supersaurus-specific herd evidence; group behavior remains an inference.
  • Tail use (inferred): diplodocids had long, flexible tails; hypotheses include signaling, balance, and (controversially) whip-like cracking-none are directly testable from Supersaurus behaviorally.
  • Reproduction (inferred): as a non-avian dinosaur, it almost certainly laid eggs; nesting biology is not directly documented for Supersaurus fossils.

Cultural Significance

Supersaurus became a pop-culture name for 'longest' dinosaurs, common in museum signs and media. It shows the richness of the Morrison Formation and a problem for the study of dinosaurs: big broken bones can be given to different diplodocids (Diplodocus, Barosaurus, Apatosaurus), changing size estimates.

Myths & Legends

Supersaurus vivianae got its super-lizard name during the late 1900s surge of big Morrison finds, showing how one huge bone can grab the public's imagination before a full skeleton is found.

The species name vivianae honors a person who helped find or collect Supersaurus, noted in the original description. This common practice links fossils to the human stories of fieldwork in the American West.

Supersaurus (Supersaurus vivianae) is often called the 'longest dinosaur' in museums and books. Because many bones are missing and experts argue which bones belong to it, very large size guesses continue.

Conservation Status

NE Not Evaluated

Has not yet been evaluated against the criteria.

Population Unknown

Life Cycle

Birth 25 hatchlings

Lifespan

In the Wild
0 years

Reproduction

Mating System Data Deficient
Social Structure Aggregation Group
Breeding Pattern Seasonal
Fertilization Internal Fertilization
Birth Type Internal_fertilization

No direct evidence exists for Supersaurus vivianae mating; by analogy with other sauropods and living archosaurs, adults likely aggregated seasonally, mated via internal fertilization, and showed little or no stable pair-bonding, with limited post-laying care.

Behavior & Ecology

Social Herd Group: 10
Activity Cathemeral
Diet Herbivore Likely conifer and ginkgophyte foliage (inferred from Morrison Formation plant availability and diplodocid-style cropping; no direct gut-content evidence for Supersaurus vivianae).

Temperament

Generally non-aggressive herbivore; avoids conflict when possible
Vigilant; increased alertness in groups and near juveniles
Defensive when threatened; relies on size, tail strikes, and group cohesion
Low territoriality; ranges likely overlap broadly with other large herbivores

Communication

low-frequency rumbles Inferred, suitable for long-distance signaling in large-bodied animals
shorter grunts or snorts Inferred, close-range coordination within groups
visual displays: neck and body posture changes for spacing and dominance Inferred
tactile contact: flank/neck rubbing in close groups Inferred
substrate-borne vibration via footfalls for group cohesion Inferred
tail movement and strikes as deterrent signals Inferred

Habitat

Biomes:
Temperate Grassland Temperate Forest Wetland Freshwater
Terrain:
Plains Riverine Valley
Elevation: Up to 4921 ft 3 in

Ecological Role

Megaherbivorous primary consumer in Late Jurassic Morrison Formation floodplain ecosystems.

Large-scale biomass removal (browsing/cropping) influencing vegetation structure and regeneration patterns Nutrient cycling via high-volume dung deposition and associated soil fertilization Physical disturbance/creation of patches and pathways through trampling and foraging Potential long-distance propagule/seed movement indirectly via ingestion/transport (plausible for some plant propagules, though unconfirmed for this species)

Diet Details

Other Foods:
Conifer foliage Ginkgophyte leaves Cycad and bennettitalean fronds Fern and tree-fern fronds Horsetails

Human Interaction

Domestication Status

Wild

Supersaurus vivianae is an extinct diplodocid sauropod from the Late Jurassic Morrison Formation. It was never domesticated. Human contact is indirect: discovery, digging, fossil cleaning, study, museum display, education, and fossil collecting and trade. Named by James A. Jensen (1985); later finds (Lovelace, Hartman & Wahl 2007) improved anatomy but added no domestication history.

As a Pet

Not Suitable as Pet

Legality: Not possible: Supersaurus vivianae is extinct, so no one can legally keep a living one. Laws may cover dinosaur fossils (digging, owning, selling, exporting) and depend on land, permits, and heritage laws.

Care Level: Expert Only

Purchase Cost:
Lifetime Cost:

Economic Value

Uses:
Scientific research value (systematics, sauropod biomechanics, Jurassic paleoecology) Museum and educational value (exhibits, casts, outreach) Tourism/heritage value (museums, local geotourism tied to Morrison Formation dinosaurs) Commercial fossil market value (where legally collected/owned; ethically debated)
Products:
  • Museum exhibits and mounted skeletons (original material where legal; often supplemented by casts)
  • Replicas/casts of vertebrae and limb elements attributed to Supersaurus-grade diplodocids
  • Educational materials (curricula, documentaries, popular science books)
  • Scholarly outputs (peer-reviewed descriptions, phylogenetic datasets)
  • Fossil preparation and curation services (lab preparation, conservation)

Relationships

Predators 4

Allosaurus
Allosaurus Allosaurus fragilis
Torvosaurus Torvosaurus tanneri
Ceratosaurus
Ceratosaurus Ceratosaurus nasicornis
Saurophaganax Saurophaganax maximus

Ecological Equivalents 4

Animals that fill a similar ecological role in their ecosystem

Diplodocus
Diplodocus Diplodocus carnegii A Morrison Formation diplodocid from the same time. It fed at low-to-mid heights, had a long, whip-like tail and neck, and is used as a stand-in to estimate Supersaurus's feeding height and movement because Supersaurus remains are fragmentary.
Barosaurus
Barosaurus Barosaurus lentus Very long-necked diplodocid often compared to Supersaurus for extreme neck length and overall body elongation. Both are interpreted as bulk-feeding, ground-cropping to mid-level browsers in semi-arid floodplain environments.
Apatosaurus Apatosaurus louisae Large Morrison Formation sauropod that shared habitat and a broad herbivorous niche; compared to Supersaurus for differences in robustness versus elongation — Apatosaurus is generally reconstructed as more robust, while Supersaurus is reconstructed as especially long-bodied/long-necked in many estimates.
Giraffatitan Giraffatitan brancai Not a Morrison taxon, but a frequent ecological comparator: it represents a very large, high-browsing sauropod (brachiosaurid body plan) contrasted with diplodocid-style lower browsing, and is useful for explaining how Supersaurus likely partitioned vegetation differently from tall-shouldered sauropods.

The supersaurus was one of the largest dinosaurs to ever exist. Its neck alone could be as long as 50 feet!

Scientific Name

The official scientific name of the supersaurus is Supersaurus vivianae. The history of the supersaurus is quite complicated, and several aspects of it are still untapped. Its name was given by paleontologist Brian Curtice after he analyzed the bones from a specimen in Colorado. The name “supersaurus” literally means “super lizard,” referencing the elongated shape of their bodies. They were very similar in shape and size to other massive sauropods of their time, such as the apatosaurus and the brachiosaurus. They belong to a genus of diplodocid sauropod dinosaurs.

Supersaurus Summary

The supersaurus was a giant herbivore with an elongated tail and neck. The animal lived between 145 to 155 million years ago during the late Jurassic period. This giant inhabited several regions of North America, and its fossils were found in areas of Wyoming, Colorado, and Portugal. While these animals are known to feed on plants, they had no known predators due to their enormous size.

Description & Size

The supersaurus was a gigantic animal with front legs longer than its back ones. Its legs were like those of an elephant, broad with five-toed feet. One toe on each of their feet had a thumb claw, most likely to protect them from predators or other aggressive sauropods. The animal had a tiny skull and head compared to its overall body size. It also had an extremely long neck, reaching up to 39-50 feet, allowing it to reach the leaves of very tall trees. Its elongated body was almost five stories tall (50 ft) and 14 car lengths long (120-140 ft). While this creature was enormous, it was not the largest or heaviest animal of all time. This title belongs to the blue whale. A large part of its body was just its neck and tail. Its body proportions are as follows:

Overall Body Length128 – 137 ft
Weight70000 – 80000 lbs
Height50-60 ft
Neck Length39-50 ft
Supersaurus neck and head

The supersaurus had a tiny skull and head compared to its overall body size. It also had an extremely long neck.

Diet – What Did the Supersaurus Eat?

The supersaurus had a diet comprised of only plants, making it an herbivore. Considering its size, it’s likely that the dinosaur consumed a large number of plants every day. Based on fossil remains, we know the animal had blunt teeth, suitable for stripping foliage. Thus, it was very prone to stomach ulcers or gastroliths. Another possible food source for the supersaurus was conifers that grew abundantly during the Jurassic period. They also could have fed on gingkos, seed ferns, cycads, bennettitaleans, ferns, club mosses, and horsetails. It must be noted, however, that all of this information is based on assumptions, which are based on the information we have about the Jurassic period.

Habitat – When and Where It Lived

A humongous, herbivorous creature living during the late Jurassic period, the supersaurus is likely to have lived in extensive grasslands and lush forest habitats.

The herds of the supersaurus likely migrated to richer feeding grounds once the areas they inhabited became barren from overfeeding. Their long necks enabled them to reach the foliage on treetops, giving them the ability to reach more food than most other animals living at the time. Scientists discovered the supersaurus’ fossils primarily in North America.

Threats and Predators

Based on the overall body structure of these animals, paleontologists have concluded that these animals were probably slow movers, which might’ve made them susceptible to predation. However, many scientists also believe that the supersaurus had no predators due to its immense size. While predators of the Jurassic period were large, they were still much smaller compared to the supersaurus. It would have been very difficult for animals such as the Allosaurus to take down a full-grown supersaurus.

Juveniles would have been more susceptible to predation. Still, since these animals likely traveled in large packs, it is unlikely that predators commonly hunted these large sauropods.

Discoveries and Fossils – Where It Was Found

The first fossils of this dinosaur were found in the US, in western Colorado. These were found by paleontologist James A. Jensen in 1972 and were named 13 years later. This fossil specimen mainly consisted of two shoulder blades, ribs, neck vertebrae, and a pelvis, giving a rough idea of what the animal might’ve looked like.

Many other similar species of sauropods also lived during the Jurassic era. So, fossils of the Supersaurus were often mistaken for other enormous dinosaurs, including Camarasaurus, Apatosaurus, and Brachiosaurus. In fact, paleontologists used the bones of other dinosaurs to create a model of what the Supersaurus might have looked like before enough fossils were collected to recreate the creature in its entirety.

Extinction – When Did It Die Out?

The Supersaurus went extinct during the Triassic-Jurassic extinction. Several factors contributed to this, including slowly developing sea-level changes, oceanic acidification, and climate change. One theory is that an asteroid or comet might’ve hit the earth during this mass extinction event. This event killed an estimated 70 percent of all animals, including every dinosaur species.

Similar Animals to the Supersaurus

Similar animals to the Supersaurus include: 

  • Apatosaurus: One of the largest land animals to have existed, the apatosaurus had a height of 75 ft and weighed about 50,000 lbs. Similar to the supersaurus, it had a very long neck.
  • Diplodocus: A long-necked, four-legged animal, the diplodocushad had a whip-like tail. 
  • Brachiosaurus: The brachiosaurus had four legs, a long neck, a small skull, and a long muscular tail, which was quite similar in structure to that of the supersaurus.
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Sources

  1. Dino Fandom / Accessed November 2, 2022
  2. Enchanted Learning / Accessed November 2, 2022
  3. Dinosaur pictures / Accessed November 2, 2022
Lev Baker

About the Author

Lev Baker

Lev is a writer at AZ Animals who primarily covers topics on animals, geography, and plants. He has been writing for more than 4 years and loves researching topics and learning new things. His three biggest loves in the world are music, travel, and animals. He has his diving license and loves sea creatures. His favorite animal in the world is the manta ray.
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Supersaurus FAQs (Frequently Asked Questions)

This dinosaur lived about 155-145 million years ago, during the late Jurassic period.