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A Jurassic 'beaver'
Well, it had a beaver-like tail at least, and it is the oldest known
semi-aquatic mammal, dated at 164 million years old. It's the biggest
mammaliaform known from the Jurassic, although it's only a little bigger than a
gray squirrel. It looks like Mesozoic mammals are considerably more diverse
than had been thought. It's in the latest Science; New Scientist has a news
And for the dinosaur connection, it comes from the same deposits as Pedopenna,
the enigmatic 'feather-foot' theropod.
Jeff Hecht, science & technology writer
Boston Correspondent: New Scientist magazine
Contributing Editor: Laser Focus World
525 Auburn St., Auburndale, MA 02466 USA
v. 617-965-3834; fax 617-332-4760