Well, the very distant ancestors of the venus fly trap probably didn't have such highly developed traps. Early venus fly traps were probably a little sticky or something, and as the crappier (or less sticky) traps started getting weeded out of the population, the better traps started to dominate. Slowly they began to develop tactile responses to stimuli (to close the trap). Also, one random mutation wouldn't generate a perfect trap. It probably happened over a very very long time, with little increments along the way.
Again, just speculation. I would like to read a paper on the evolutionary history of the trap and see if anybody knows how it developed.
I am no botanist but I did study some comparative vertebrate anatomy and got interested in poisonous snakes.
You might look at a rattlesnake- highly toxic poison, long folding hypodermic needle type fangs. Wos... how did THAT "just happen"?
We dont have a fossil sequence, but we do have living snakes that have teeth and saliva glands (that is what the poison is, a toxic saliva) in several intermediate stages from your harmless garter snake up to the vipers.
Here goes! I used to catch garter snakes and wondered why the bite from their tiny teeth would bleed so much. Found out there is some anticoagulant property to the saliva. Interesting.
There are "rear fanged" snakes with slightly enlarged teeth at the back, where the saliva gland opens. And slightly toxic saliva. (apparently some people allergic react to even a garter snake bite!) A snake trying to swallow a frog or mouse that is struggling will be better off if the saliva helps kill it.
Then you find rear fanged snakes with longer teeth and a groove, a fold in the enamel that lets the saliva be ducted more efficiently.
There are other snakes with a reduced number of teeth in the front of the maxillary bone and the grooved fangs closer to the front.
Also with the fangs now at the front, with only two tooth sockets left in the shortened maxillary.
The fangs have a deep groove that is folded shut now. A cross section of the tooth shows that it is enamel on the inside of the poison duct and plain as can be it is simply folded inside.
All this time the poison has been getting more and more effective.
Some of them rotate the maxillary to fold the long fangs up out of the way when the mouth is shut. The maxilarry on any snake is loose and movable, thats part of how they eat. In others like a cobra, the fangs are short and dont fold up.
Some evolutionary sequences are difficult to see how they happened.
Actually there is a whole lot of things we have not figured out about the world around us. heck.. at the time of the American Revolution people still thought there was an undiscovered continent in the south pacific. Sent out expensive expeditions looking for the imaginary "terra australis".
There are evolutionary sequences that are easy to see how they went though, and they point out ideas about how other things may have happened.
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