Try amphioxus again (for inverts to verts). Although, note that it is not a true intermediate, since it is an extant genus; however, it provides vital clues as to what the “true intermediate” was like.
And, as tomndebb mentioned, Archaeopteryx* is far from being “horrible at best” - it possesses features of both dinosaurs and birds (and it is not alone in possessing those features. See “maniraptorans”)
**
Sorry, but you’ll have to do better.
**
We also call those dinosaurs! Minus the feathers (which are diagnostic of birds), Archaeopteryx would have been mistaken for a small dinosaur.
**
First: you are aware of the processes involved in fossilization, correct? If so, then you should realize that fossilization is a rare occurance, and only a very small fraction of the organisms which ever lived have been fossilized.
Second: you are aware of the geological processes of “erosion”, “subduction”, and “obduction”, right? If so, then you realize that even if an organism manages to leave a fossil, these processes can, and do, destroy countless numbers of them, before we ever see them.
We don’t find intermediates because of geology and the way fossilization works, not because they did not exist.
**
I thought you said we didn’t have any intermediates!
And of what consequence is it that amphioxus is small (one does not need a microscope to see one, by the way)? And the “backbone” is only suspect to those who don’t comprehend biology (it’s called a “notochord”, by the way).
**
The Genesis account also claims that the sun and moon weren’t created until the “fourth day”, and that their purpose was to “…be for signs, and for seasons, and for days, and years…”. Yet there were supposedly three “days” before then…how were they measured? How long were they?