Australia, say hello to your newest
dinosaur.
Well, it's as new as anything that died
out 65 million years ago can be.
Kunbarrasaurus ieversi, a bulky,
armoured beast with similarities to the stegosaurs, bit the dust along with the
rest of the dinosaurs at the end of the Cretaceous period.
The fossil with a parrot-like beak and
an inner-ear like that of a turtle was dug up in central north Queensland in
1989 but only now classified as its own special form.
It remains one of the world's most
complete examples of an ankylosaur, a vicious-looking genus with a bony skin
shell (known as dermal armour) and lethal-looking tail club.
Despite their menacing exterior, the
genus is entirely herbivorous.
Kunbarrasaurus was so well preserved,
with bones still connected, scientists studying its skeleton could identify
seeds and leaves from its last meal, more than 65 million years ago.
It had previously been classified as an
example of another well-known Queensland dinosaur - minmi, which was found near
Roma in 1964 and constructed from a much less complete fossil.
But after extensive study of the
dinosaur's skull, a research team led by University of Queensland PhD student
Lucy Leahey decided kunbarrasaurus was different enough for its own
classification.
"The shape and the textures on the
dermal armour is different, the hand from minmi is different to kunbarrasaurus
and the vertebrae is different," she said.
"Most of the bits are different.
There are a couple of things that are similar but the majority are
different."
Ms Leahey said as a PhD student she
felt lucky to be able to study the find, let alone having the rare achievement
of naming a new form.
She said the newly categorised
Cretaceous period creature appeared to be much less advanced than other
ankylosaurs uncovered in the Northern Territory.
The northern Queensland find was
smaller and less well-armoured, which Ms Leahey said was an advantage for
scientists in some ways, because its armour had not fused to its skeleton,
making it easier to study.
"Kunbarrasaurus represents a more
primitive form of ankylosaur, so it's not as advanced as what you see in the
popular literature from North America and Asia," she said.
"Those guys have the huge spikes
and plates and big tail clubs.
"Kunbarrasaurus doesn't have that.
It does have dermal armour but it's not as big or impressive as what you see
overseas but that's really great because we can see a lot of the bones
underneath."
UQ School of Biological Sciences senior
lecturer Dr Steven Salisbury, Ms Leahey's research supervisor, said the newly
named creature appeared to have come from about the time the ankylosaurs
diverged from the other main lineage of armoured dinosaurs, the better-known
stegosaurs.
By Jorge Branco
With many thanks to the Brisbane Times
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