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"Are you saying that a revived 50,000 year old cockroach would not be able to mate and produce fertile offspring with present day cockroach?"

You are, perhaps, not aware that there are numerous species of cockroaches right now on this planet. Most cannot intebreed with other species of cockroaches.

So, there is no "present-day cockroach." There are many different species in the cockroach family. Yet, we call them all cockroaches. Evolution at work.

So, there is no "present-day cockroach." There are many different species in the cockroach family. Yet, we call them all cockroaches. Evolution at work.

Yeah, and we call lots of different critters "bugs", that doesn't mean that one came from another. We can use a (purportedly) 50,000 year old horse, if you like. It would be harder to revive.

And of course, our naming system is somewhat arbitrary. We group things together according to similarities but the construct is of course, artificial by definition. (e.g. by one standard peanuts are regarded as nuts, but by others they are not nuts).