I said so many times that speciation is not a reason for the original species to go extinct. It’s actually a key element of my argument especially with respect to alleged Hominin Evolution.
If the alleged human transformation from LCA to Homo sapiens ever happened through speciation / transitional forms, then, we should see different human species today especially in isolated geographical areas. They cannot all go extinct. All living human beings on earth today belong to the same Homo sapiens species. The alleged speciation of humans never happened.
If the ability of interbreeding is lost among some variants, it will never transform into totally different species. Even if we intentionally try creating a new species through artificial breeding, it will always be variants of original species. If we produce hybrids such as a mule or a liger it will always be infertile. Being infertile, it will not be a new species.
Anatomical diversity can be seen within the same species such as the horse kind today. Modern horses come in a wide range of sizes (28” to 72”) and forms but they all coexist and didn’t evolve from each other. If such anatomically diverse species is fossilized, it may be interpreted as a lineage of transitional forms but if the fossils have the same age range and found within the same strata, then it didn’t evolve from each other.
A direct line of descent with chronologically ordered fossils that exhibit gradual change of the specific lineage is required if the alleged gradualism is true. Such gradualism is virtually nonexistent in the fossil record.
This alleged transformation of one species into totally different species, is not science. It’s neither possible nor there is any evidence for it. It’s nothing but a “historical narrative” as stated by Ernst Walter Mayr in his book “What Makes Biology Unique?”. See # 331
Darwin's Illusion | Page 17 | Religious Forums
The context here is the alleged transformation of one species into another, which necessitate numerous transitional forms. These transitional forms are necessarily ancestral to the descendant species of the same lineage.
It’s not enough to claim some sort of unknown relationship. You need to establish a lineage. If no alleged transitional forms can be proven to be ancestral to a present descendant species, then evolution is discredited.
Except that without a transitional species for the ancient ancestor that supposedly found its way earlier to the land and without any gradualistic line of descent (none) with a direct ancestor-descendant evolutionary sequence, the whole story remains as unsubstantiated guesswork (historical narrative).
The story of the two brothers who got separated and met later as strangers who don’t recognize each other anymore is nothing but a “historical narrative” that neither qualifies as science nor a ridiculous bad movie. It doesn’t prove anything.
You cannot prove the alleged gradualism without a direct line of descent that exhibits continuous gradual change and leads from an ancestral to a present species (which was never established for any species).
Without the predicted numerous transitional forms that fit on a coherent evolutionary developmental line in a linear progression and chronologically ordered fossils, gradualism is false.