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Re: Segregated vs age-mixed sauropod herds

On Mar 15, 2010, at 11:57 PM, Tim Williams <tijawi@yahoo.com> wrote:

The same study estimated that the monotreme line (stem-group - would that be 'Prototheria'??) diverged from the Theria in the Early Jurassic.

Total group (or total clade), not stem group. "Prototheria" is the name for it (or "pan-Monotremata"). The stem group would be the non- monotreme prototheres ("stem-monotremes").

Isn't Mammalia (crown group) usually thought to have originated in the Triassic?

Mike Keesey