Everything about Barosaurus totally explained
Barosaurus (BARR-oh-SAWR-us) meaning 'heavy
lizard' (
Greek barys/βαρυς meaning 'heavy' and
saurus/σαυρος meaning 'lizard', referring to its heavy neck bones) was a giant, long-tailed, long-necked,
plant-eating dinosaur closely related to the more familiar
Diplodocus. Remains have been found in the
Morrison Formation from the
Upper Jurassic Period, along with five other
sauropods:
Diplodocus,
Apatosaurus,
Camarasaurus,
Brachiosaurus and
Haplocanthosaurus, as well as the predator
Allosaurus and
armored dinosaur
Stegosaurus.
Description
Barosaurus was a large but fairly typical
diplodocid that lived during the Late
Jurassic period, around 150
million years ago. In fact, in many respects
Barosaurus was very similar to
Diplodocus itself, but with slight differences: much taller backbones (
vertebrae), a shorter
tail, and a much longer
neck. Probably more than four-fifths of this
plant-eater's total length of perhaps 27 m (89 ft) was neck and tail. Presumably it had a small head, although unfortunately no specimen of its skull has been recovered, which is common in sauropods because of the small skull size.
The
American Museum of Natural History in
New York City has a skeleton of a mother
Barosaurus rearing on her hind legs to an enormous height to protect her offspring from an
Allosaurus. Her head is level with the fifth story of a building.
A very long neck
Barosaurus' was once thought to have held its head like a giraffe. In order to pump blood up to the brain – a height of around 12 m(39 ft), 10 m (33 ft) above the heart – the heart would have had to have weighed about 1.5
tonnes (3,200 lb). The larger a heart, the slower it beats. A 1.5 tonne heart would beat so slowly that the blood would run back down the neck before the next beat. To address this problem a radical theory was postulated that
Barosaurus had 8 hearts – two in the chest and three pairs in the neck. A more reasonable alternative theory is that, like a giraffe, it had
arterial valves in its neck. These operate in response to
differentials in fluid
pressure, allowing the blood to be pumped up the neck but preventing most of it from falling back down. More recent computer modeling of
diplodocids has shown that they probably habitually held their necks more or less horizontally, thus restricting the problem to whether the animal reared up on its hind legs or not.
Although it had just 15 cervical vertebrae (neck bones), as in the shorter-necked
Diplodocus, some of them were more than 1 m (39 in) long. The scoops and hollows in their structure mean that the neck as a whole was lighter than it looked.
Discovery and Species
Barosaurus lentus is one of the many
sauropods discovered in
North America during the "Wild West Dinosaur Hunts" (the "
Bone Wars") of the late
19th century.
The remains were initially found by a Mrs E. R. Ellerman in the Black Hills of
South Dakota.
Othniel Charles Marsh and
J. B. Hatcher collected part of the tail of the skeleton and Marsh named it in 1890. The rest of the remains were protected until Marsh sent George Wieland to collect them in 1898. Some remains of a smaller dinosaur collected at the same time were named (but not officially described)
Barosaurus affinis in a paper by Marsh one month before
his death in 1899.
Starting in 1922, three fairly complete
B. lentus skeletons were dug out of Carnegie Quarry,
Utah, by a team lead by
Earl Douglas of the
Carnegie Museum of Natural History, in
Pittsburgh, Pennsylvania. Earlier, he'd excavated
Apatosaurus from the same site, and had been involved in setting up the
Dinosaur National Monument there in 1915.
A partially complete, 24m-long
Barosaurus specimen was forgotten at the
Royal Ontario Museum (ROM) in
Toronto, Ontario. Left for 45 years in storage, the massive fossils were rediscovered in 2007 on various shelves and in drawers throughout the museum's private collection . It was discovered by Dr. Dave Evans through a reference to a
Barosaurus specimen at the ROM in a paper by Jack McIntosh. After some investigation it was discovered that there was nearly 50% of the skeleton in the storage areas at the ROM. Research Casting International was commissioned to mount the skeleton for display in the Temerty Galleries at the ROM
(External Link
). The display, which is the first mounted fossil
Barosaurus skelton in the world, was unveiled on December 12, 2007.
Late Jurassic remains from
Tanzania, originally named
Tornieria africana, are considered by some to be another species of
Barosaurus,
B. africanus, although others disagree with this and consider
Tornieria a separate, valid genus. J. S. McIntosh, in 2005, noted similarities of the material with both
Barosaurus and
Diplodocus (possibly more with the latter) but differences as well. He concluded that further review of the material in Berlin was warranted, before it could be placed in
Barosaurus.
A third barosaur species,
B. gracilis, has also been identified from Africa. If
B. africanus is actually
T. africana, then
B. gracilis is also likely to be a species of
Tornieria, called
T. gracilis (External Link). See the article
Tornieria for further discussion.
Barosaurus species
Nomen dubium
B. affinis Marsh (1899) now considered synonymous with
B. lentus.
Further Information
Get more info on 'Barosaurus'.
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