Re: paleonet fossils and molecular data

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The origin of vesicomyid bivalves has been placed as Oligocene by molecular data despite Cretaceous fossils.
The Homo-chimp split has been placed as recent as 3-4 mya in molecular studies.  I am not sure how or if they were calibrated.  
Suzuki,T., Kawasaki,Y., Unemi,Y., Nishimura,Y., Soga,T.,      Kamidochi,M., Yazawa,Y. and Furukohri,T. Gene duplication and fusion have occurred frequently in the evolution of phosphagen kinases - A two-domain arginine kinase from the clam Pseudocardium sachalinensis. Biochim. Biophys. Acta (1998) calculated 200 something mya for the chiton-gastropod split and 400 something for the split of these two from bivalves.  Chitons are known at least from the late Cambrian, bivalves from the early Cambrian, and gastropods roughly late Cambrian.  Their lineages split earlier.  

    Dr. David Campbell 
    Old Seashells 
    University of Alabama 
    Biodiversity & Systematics 
    Dept. Biological Sciences 
    Box 870345 
    Tuscaloosa, AL  35487 USA
    bivalve@mail.davidson.alumlink.com

That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at Droitgate Spa

---------- Original Message ----------------------------------
From: f.j.lindemann@nhm.uio.no
Reply-To: paleonet@nhm.ac.uk
Date:  Mon, 09 Sep 2002 14:49:27 +0200

>For a short presentation of the above I am looking for examples of fossils 
>that demonstrate a considerably older age that that estimated for the same 
>lineage on the basis of molecular data. Do you know of any?
>
>fj
>
>
>Franz-Josef Lindemann
>Paleontologisk museum
>P.O.Box 1172 Blindern, N-0318 Oslo
>Sars' gate 1, N-0562 Oslo
>Phone: +47 22 85 16 59
>Fax: +47 22 85 18 00
>
>
>