I think the most recent is probably the "discovery" that the Coelacanth was not a long extinct animal, but that they were living in reasonable numbers off the coast of Africa. That happened in 1938 when a museum curator happened to see one in a fisherman's boat in South Africa. We have since discovered a second species of this fish in a distant separate area of the Indian ocean. Yes they are rare and regarded as endangered animals but we have something on this planet of a species which has been around for over 350 million years.<br><br>We may yet find more strange and long thought as extinct creatures in our oceans, so further discoveries should not be unexpected. So let's be thankful for the surprises we can still find.