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Hmm...Violet Cadovermis and Flugwurms do share a common ancestor, although they're in different genuses. Since one's from Generation 140 and another is from 144, that would suggest they've had plenty of time to accumulate genetic differences, especially since they likely have very rapid generations.

For comparison, it's believed grizzly bears (North American brown bears) and polar bears diverged 500,000 years ago, and zebras and donkeys diverged 1.69-1.99 million years ago.

On the other hand,inter-genus hybrids inter-genus hybrids do exist: red junglefowl (the ancestors of chickens) and common pheasants diverged diverged 18-23 million years ago, but chicken-pheasant hybrids exist and at least some are fertile.

Flugwurms are, themselves, hybrids of Clear-Wing Worms (the ancestor of Cadovermis) and Cadovermis, which complicates things more.

It might depend on the degree of genetic drift, or whether chromosome numbers changed throughout time.

"While rare mating attempts between the two were relatively rare, and successful fertilizations even more so," That's two uses of "rare".

Made the fix. Also, part of the reason for this is that the flugwurm having metamorphosis has been viewed as incredibly improbably, if not outright impossible, given their evolutionary history, and this is meant to correct that while putting pressure on the flugwurms at the same time.

that a few a year to occur,
"a few a year".
"While said ancestor [...]small objects" that is a very long sentence.
"offer"? Don't you mean "bare" or "present"?
Is it true live birth, or ovoviviparity? Do they have a placenta/placenta-like structure?

Okay, made the edits and clarified better.