In the movie Jurassic Park,
scientists extract dinosaur DNA from the bellies of prehistoric
mosquitoes preserved in amber. Now researchers have done away with the
middle man.
Palaeontologists have
found the feathered tail of a 99 million-year-old dinosaur encased in a
piece of amber at a jewellery market in Myanmar. The discovery,
outlined today in the journal Current Biology, marks the first confirmed find of a dinosaur fossil trapped in the resin.
It
is also the first time scientists have been able to observe intact
dinosaur feathers, gleaning vital clues about their structure and
colour. Co-author Ryan McKellar said while amber pieces could capture
only “tiny snapshots” of ancient critters, they were invaluable. “They
record microscopic details, three-dimensional arrangements and labile
tissues that are difficult to study in other settings,” said Dr
McKellar, of the Royal Saskatchewan Museum in Canada.
“This is a new source of information that is worth researching with intensity.”
Amber is fossilised tree resin that often traps bugs and plant fragments before it hardens.
Biologists
have found mating flies, stingless bees, midges, ants, wasps, beetles,
spiders and mammals’ hair in chunks of the yellowish gemstone.
Some
of the finds are highly significant. In March, US researchers reported
finding the forerunner of the malaria parasite in a 100 million-year-old
biting insect fossilised in amber from Myanmar.
Prehistoric
feathers have previously been discovered in amber from Canada and
France, but it was impossible to tell whether they came from dinosaurs
or birds.
“In this piece of amber, we
finally have skeletal remains that allow us to pin down the source
animal and say that we are dealing with a dinosaur,” Dr McKellar told The Australian.
CAT
scans and microscope studies revealed the 4cm-long tail was flexible,
not fused like a bird’s. The team believes it comes from a juvenile
coelurosaur, a huge dinosaur group that included the tyrannosaurs.
Feathers
along each side appear pale underneath and brown on top, although Dr
McKellar said their preservation in amber could have changed the
colouring. He dismissed any suggestion the find could be used to clone
dinosaurs, Jurassic Park-style.
“Recent work has suggested that it is almost impossible to preserve DNA in amber for thousands of years, let alone millions.”
In
separate research, scientists have found one of the oldest known
tumours in a 255 million-year-old fossil of a predator known as a
“gorgonopsian”.
US researchers found a
benign tumour called a “compound odontoma” in the jawbone of a Tanzanian
gorgonopsian, one of a group of land carnivores that preceded mammals
and could grow to the size of polar bears.
Odontomas
are tumours made of dental material. Until now their appearance in the
fossil record has been restricted to more recent creatures such as
mammoths and prehistoric deer.
The new find is not the oldest known cancer — that honour belongs to a 300 million-year-old fish.
By John Ross
With many thanks to The Australian
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