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Bukti baru untuk  kanibalisme di tyrannosaurus

Sebuah studi baru mendokumentasikan cidera pada tyrannosaurine. Makalah ini menunjukkan bahwa tengkorak genus tyrannosaur , Daspletosaurus , menderita banyak cedera selama hidup , setidaknya beberapa yang juga mungkin ditimbulkan oleh Daspletosaurus lain . .... Dengan demikian ada bukti pertempuran antara dua karnivora besar serta satu memakan yang lain ...read more

New evidence for
combat and cannibalism in tyrannosaurs

Date:

April 9, 2015

Source:

PeerJ

Summary:

A new study documents
injuries inflicted in life and death to a large tyrannosaurine dinosaur. The
paper shows that the skull of a tyrannosaur genus, Daspletosaurus, suffered
numerous injuries during life, at least some of which were likely inflicted by
another Daspletosaurus. It was also bitten after death in an apparent event of
scavenging by another tyrannosaur. Thus there's evidence of combat between two
large carnivores as well as one feeding on another after death.

..........................

A new study documents
injuries inflicted in life and death to a large tyrannosaurine dinosaur. The
paper shows that the skull of a genus of tyrannosaur called Daspletosaurus suffered numerous injuries during
life, at least some of which were likely inflicted by another Daspletosaurus.
It was also bitten after death in an apparent event of scavenging by another
tyrannosaur. Thus there's evidence of combat between two large carnivores as
well as one feeding on another after death.

Daspletosaurus was a large carnivore that lived in Canada and was only a little
smaller than its more famous cousin Tyrannosaurus. Like other
tyrannosaurs it was most likely both an active predator and scavenger. The
individual in question, from Alberta Canada, was not fully grown and would be
considered a 'sub-adult' in dinosaur terms (approximately equivalent to an
older teenager in human terms). It would have been just under 6 m long and
around 500 kg when it died.

Researchers found numerous injuries on the skull that occurred during life.
Although not all of them can be attributed to bites, several are close in shape
to the teeth of tyrannosaurs. In particular one bite to the back of the head
had broken off part of the skull and left a circular tooth-shaped puncture
though the bone. The fact that alterations to the bone's surface indicate
healing means that these injuries were not fatal and the animal lived for some
time after they were inflicted.

Lead author Dr David Hone from Queen Mary, University of London said
"This animal clearly had a tough life suffering numerous injuries across
the head including some that must have been quite nasty. The most likely
candidate to have done this is another member of the same species, suggesting
some serious fights between these animals during their lives."

There is no evidence that the animal died at the hands (or mouth) of
another tyrannosaur. However, the preservation of the skull and other bones,
and damage to the jaw bones show that after the specimen began to decay, a
large tyrannosaur (possibly of the same species) bit into the animal and
presumably ate at least part of it.

Combat between large carnivorous dinosaurs is already known and there is
already evidence for cannibalism in various groups, including tyrannosaurs.
This is however an apparently unique record with evidence of both pre- and
post-mortem injuries to a single individual.







Story Source:

The above story is based on materials provided by PeerJ. Note: Materials may be edited
for content and length.







Journal Reference:

1.    Hone and Tanke. Pre- and
postmortem tyrannosaurid bite marks on the remains of Daspletosaurus
(Tyrannosaurinae: Theropoda) from Dinosaur Provincial Park, Alberta, Canada. PeerJ,
2015 DOI: 10.7717/peerj.885

http://www.sciencedaily.com/releases/2015/04/150409083201.htm

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