Originally posted by kensei
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We know now that evolution doesn't work that way, and any species that exists is fully realized for its own environment, and not in any kind of developmental process. Evolution does proceed with any kind of design in mind, and "transitional species" is essentially a myth.
Aside from that, though, the modern coelacanths are not identical to any of the fossil species from 360 million years ago. They just aren't different enough to be a new order, and while they are not representative of any species thought to be extinct, they have traits thought to be extinct.
There are other very old orders that have living species still represented. There are some orders of reptiles that are 220 million years old, and plenty of plants and invertebrates that leave coelacanth in the dust (the fossil record is sketchier on invertebrates, though, for obvious reasons), but coelacanths do represent just about the oldest order of the phylum vertebrates.
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