[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Brontosaurus/Apatosaurus

At 11:49 AM 6/12/98 -0700, Betty Cunningham wrote:
>Does this actually mean what I think it means? That a juvenile 
>sauropod has a different number of vertebrae than an adult?

Almost.  It has a different number of *sacral* vertebrae (that is, the ones
that are fused with the pelvis).  The total count may well be the same.

>  How do you figure?

What often happens is that posterior dorsals and/or anterior caudals get
recruited into the sacrum as the animal grows.  This is more or less a case
of development recapitulating phylogeny.

May the peace of God be with you.         sarima@ix.netcom.com