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Re: Re: News Flash: Ungulates and Dinosaurs Together 80 million Years Ago (fwd)
Betty Cunningham writes:
>According to an AP news wire (courtesy of Darren Naish):
>> > In his study, Archibald said that rat-sized tooth fossils recovered
>> > from the Bissekty Formation in Uzbekistan resemble the shape and
>> > characteristics of teeth found in animals that lived millions of
>> > years later. The teeth had the flat, squared grinding surfaces
>> > similar to what is found now in the teeth of herbivores. Archibald
>> > said that fossils from 65 million years ago show that the diversity
>> > of ungulates then alive led to eventual development of animals as
>> > varied as antelopes, whales and elephants.
> ok, but-um- I seem to remember a NOVA special on genetics that
>discussed how the cow's stomach (what makes a cow an ungulate) was
No, Ungulata is the clade of hoofed mammals. I think you are thinking about
>developed to process grasses into more easily digestable stuff for the
>animal's system to cope with, ONLY GRASSES WEREN"T AROUND AT THE TIME
>if these are 'ungulate' teeth, right?
> So, what were these animals eating that would account for grazer's
>teeth? Wouldn't that sort of teeth seem to indicate (by the meager
>understanding of ungulates that I have) that these animals chewed a
>cud? Isn't that a rather advanced characteristic?
I think what Archibald was saying is that the Uzbekistani teeth show
synapomorphies of Ungulata. Most mammalian lineages have unique dental
characteristics, making them easy to identify from a tooth or two.
Thomas R. Holtz, Jr.
Vertebrate Paleontologist Webpage: http://www.geol.umd.edu
Dept. of Geology Email:firstname.lastname@example.org
University of Maryland Phone:301-405-4084
College Park, MD 20742 Fax: 301-314-9661
"There are some who call me... Tim."