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Re: Of Tarbosaurs and tabbies
On Thursday, March 18, 2004, at 12:35 AM, Thomas R. Holtz, Jr. wrote:
From: email@example.com [mailto:firstname.lastname@example.org]On Behalf
I should know this already, but when did the lion and tiger diverge?
Would it be accurate to say they are each branches of the same species
on the path to distinct speciation? If so, do they therefore represent
transitional forms, of the type so coveted in the fossil record?
No, lions and tigers are about as secure as species as any two taxa
is fairer to say that these are two distinct species in which genetic
morphological features to prevent interbreeding have not evolved.
OK, but doesn't that really amount to them being in the incomplete
process of diverging from each other? Shouldn't they only become
distinct species when they can no longer interbreed at all? Currently
they can still do so, but the results are inconsistent, and will
presumably eventually amount to nothing when they've evolved away from
one another sufficiently.
showed, regional varieties grade into subspecies which grade into
there aren't distinct breaks between these "ranks".
I suppose really every critter is a transition from one thing to
another. I do think "species" has been assigned all too readily, but it
seems we're moving away from that - good to see.