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teleost fish/mammal divergence

Paul M. Nealen pnealen at mail.sas.upenn.edu
Wed Dec 15 14:22:41 EST 1993

In article <1993Dec15.103255.1 at vax1.tcd.ie> rpowell at vax1.tcd.ie writes:
>	Does anyone have a timing for the divergence of teleost fish and mamals
>Richie Powell
>rpowell at vax1.tcd.ie

In the 4th edition of Evolution of the Vertebrates by Colbert and Morales
(1991, Wiley-Liss, Inc), the authors suggest the following sequence:

bony fishes originate from agnathans ca. 400 mya
amphibians originate from bony fishes ca. 370 mya
reptiles originate from amphibians ca. 310 mya
mammals originate from reptiles ca. 225 mya

The first mammals are suggeted to stem from theriodont reptiles.  Hope
this helps!


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