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新西兰发现爬行蝙蝠化石
Fossilised remains1 of a new bat species, which lived 16 million years ago, walked on four limbs and was three times larger than today's average bat, have been discovered in New Zealand. The fossils were found near Central Otago on South Island, in sediment2 left over from a vastprehistoric3 body of water known as Lake Manuherikia, which was part of warmer subtropical rainforest during the early Miocene era, between 16 and 19-million-years-ago.
The new species, Mystacina miocenalis, was described today in the journal PLOS ONE, and is related to another bat, Mystacina tuberculata, which still lives in New Zealand's old growth forests.
"Our discovery shows for the first time that Mystacina bats have been present in New Zealand forupwards4 of 16 million years, residing in habitats with very similar plant life and food sources," says lead author and vertebrate palaeontologist, Associate Professor Suzanne Hand from the University of New South Wales (UNSW) in Australia.
New Zealand's only native terrestrial mammals are three species of bat, including two belonging to the Mystacina genus - one of which was last sighted in the 1960s. They are known asburrowing5 bats because they forage6 on the ground under leaf-litter and snow, as well as in the air, scuttling7 on their wrists and backward-facing feet, while keeping their wings tightly furled.
These bats were believed to have an ancient history in New Zealand, but until now, the oldest fossil of a Mystacina bat in New Zealand was from a cave in South Island, dating to 17,500 years ago. This latest discovery forces a rethink of when these peculiar8, walking bats first crossed the ditch, arriving from what is present-day Australia.
"This helps us understand the capacity of bats to establish populations on islands and the climatic conditions required for this to happen," says Associate Professor Hand.
"Bats are important pollinators and seed dispersers that keep forests healthy. Understanding the connectivity between the bat faunas9 of different landmasses is important for evaluating biosecurity threats and conservation priorities for fragile island ecosystems10."