Rock painting reveals unknown Australian bat
Submitted by coldrum on Saturday, 31 January 2009 Page Views: 2814
Rock ArtAn ancient cave painting from northern Australia depicts a previously unknown species of large bat, researchers say.The team thinks the rock art from Australia's Kimberley region could date to the height of the last Ice Age - about 20-25,000 years ago.
The painting depicts eight roosting fruit bats - also called flying foxes.
They have features that do not match any Australian bats alive today, suggesting the art depicts a species that is now extinct.
The findings have been published online in the scholarly journal Antiquity.
The bats would not have lived in the same cave as the painting; they are depicted hanging on a vine, which indicates a lowland forest habitat.
Jack Pettigrew, from the University of Queensland, and colleagues report that the eight bats in the painting have white markings on their faces.
No present day Australian flying foxes possess these features.
Megabats
Dr Pettigrew and his team then considered whether the bat matched any living "megabats" from other parts of the world. Worldwide there are six such species, two in Africa and four living in islands off South-East Asia.
On balance, say the researchers, Styloctenium [Styloctenium wallacei, from the island of Sulawesi in the Philippines] is the closest living genus to the ancient species in the painting.
No fossil bats that could fit the bill are known from the local area.
Small fossil bats are known from Queensland's Riversleigh rocks, from which they can be extracted using acetic acid. But no flying fox remains have been found. The Queensland fossils are 30 million years older than the Kimberley flying fox.
Stripey face
The bat depictions were found on a sandstone wall protected by overhangs, near Kalumburu. They belong to a type of rock art known as "Bradshaw".
This Bradshaw rock art was painted more than 17,500 years ago by sophisticated artists. The style is spread over an area belonging to several Aboriginal nations, each of which has a different name for the rock art.
There is considerable debate about whether past mammal extinctions in Australia were caused by human hunting pressure or by climate change.
The researchers regard bats as too mobile to have been hunted to extinction by the culture that produced the cave art.
The demise of the Kimberley white-faced megabats is more likely to have resulted from the climatic and ecological changes that followed the end of the Ice Age, say the scientists.
For more, and a photo, see the bbc.
Note: White-faced megabats unknown to region in historic times.
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