The horse is also interesting in that respect. The Permian-Triassic global extinction which was the result of rapid global warming is ever so misunderstood. Mainly, because various eggheads-each-who are always right-can't seem to agree as to the number, percentage wise, as to the catastrophe in terms of extinction.
Turtles, Terrapins and Tortoises seem to survive along with some reptiles, amphibians and mollusk. Sharks, the oldest of all predators, seemed to do just fine. They have not changed one bit in all those eons-like your cockroaches. With 80%-depending on which mad scientists who you agree with-populating the oceans then why didn't sharks evolve differently-since their habit has been distorted to the extreme. Dr. Roberts explained that 95% of all life in the seas was due to rapid oxygenation. Sharks, warm blooded, were able to evolve. So, warm blooded fish, survived the catastrophic volcanic climate effect. Or so the theory goes.
About evolution as a constant stream flowing for ever everlastingly-did I miss the quote-here is a good example.
If you go to the Museum of Natural History in Philadelphia, right after you pass the little anti-room for better of an explanation, where you can watch videos and such, you walk around the left corner and wow! stands a huge creature from Carnosauria, Giganotosaurus. Talk about heart thump. Words can't describe that monster until you see it from 20ft away.
For more than a century Tyrannosauroidea held the record for being the biggest and baddest on the planet. Now we know that Tyrannosaurus rex was a scavenger and Giganotosaurus was twice as big-next to the exhibit is a skull from Giganotosaurus that is even bigger that that unholy thing. Culture shock. The point is that in 1996 everything we thought we knew-we were 110% wrong. According to Dr. Roberts' expert the much hyped Spinosaurus maroccanus, a sea scavenger, the fossil record is simply to sparse. Internet hype at it's slimiest.
There is nothing 'sparse' about that skeleton.