Thankyou for the answer. Another sort of close question.
    I do Eps. Those on our Southern shores include angulatum, humphreysi, tollini, and multistriatum. They are all distinguishable---but fairly close. The question is: Is there a common ancestor? Have shorelines chaged too much to find one? Not just Eps. Is there a "Mother-of-all" Pectens? Is there any family to which one can say: "Meet your progenitor!"
    Art
>
> From: John Jacobs <[log in to unmask]>
> Date: 2003/12/22 Mon AM 10:24:15 EST
> To: [log in to unmask]
> Subject: Molluscan origins
>
> Evidence shows that molluscs may have existed for at least 500 million
> years.  Unfortunately, the further back in time, the less likely fossils
> will be found.  Precambrian fossils are extremely rare.  As to their
> precursors, no definitive answer yet.
>
> John
> John & Cheryl Jacobs
> Seffner, Florida
> [log in to unmask]
> ----- Original Message -----
> From: <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Sunday, December 21, 2003 9:44 PM
> Subject: Question Man asks--:
>
>
> > Here in Southern Ohio, our basic layers are Ordivician. They are full of
> Brachiopods, Horn Corals, etc. But no mollusks. At least, I don't think so.
> >   The question is: when did mollusks arise---and (2) from what?
> >      Q-Man
> >
> > PLEASE NOTE: My new, long-term, and correct email address is:
> [log in to unmask] Please update your records!
> >
>

PLEASE NOTE: My new, long-term, and correct email address is: [log in to unmask] Please update your records!