That took place in 375 to 360 million years ago and is estimated to have killed at least 19% of the life in the families and the 50% of the genera of species. and at least 70% of the species on earth.
I believe the correct answer would be behavioral isolation. It is an isolating mechanism where two populations or species cannot mate because of the differences in their courtship and mating behavior. It is also called as ethological isolation.
