The new arachnid was discovered in its underground lair, a limestone cave.
Fossils reveal a rat that was 10 times the size of today's variety.
Its translucent white shell has an average height of 0.027 inches (0.7 millimeters), breaking the previous record by about a tenth of a millimeter.
The distinctive creature lived 76 million years ago, during the Cretaceous, in a modern-day Utah that looked more like Louisiana bayou country.
The reddish-brown creature is about the size of a squirrel and has been named for businessman and philanthropist Andy Sabin.
The ancient mammal used its long snout like a vacuum cleaner, pulling up food from the heavily vegetated shoreline.
The new species was found in a remote mountainous area on the island of Sulawesi.
A newly discovered snail is so small that nearly 10 of them could fit into the eye of a needle.
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