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Jan 23, 2002 |
Caves: Living Fossils
While exploring underwater caves, divers made a startling discovery -- primitive animals whose ancestors have been swimming in these waters for millennia. Music Divers exploring the depths of underwater caves have made a startling discovery - primitive animals whose ancestors have been swimming in the darkness for millions of years. I'm Jim Metzner, and this is the Pulse of the Planet. Dr. Tom Illiffe is a professor of Marine Biology at Texas A&M University. He and other researchers have explored hundreds of deep saltwater caves around the world in such places as Hawaii and the Yucatan Peninsula. He describes a dive into one of these caves as a trip back in time. "Many of the animals that we find there are essentially living fossil species. Theyre really very primitive forms of life, uh, that probably have existed on Earth for tens of millions of years and been isolated. These are animals that have adapted to life in the caves. They have lost their eyes, they have lost their pigment, features that they really dont need in the totally lightless underwater caves." One tiny animal, called Ramapedia" may have existed in these pitch black depths since the days of the dinosaur. "One of the most interesting animals that we've found in these underwater caves is a very primitive type of crustacean called Ramapedia. Ramapedia is a new class of crustacea. Its like nothing else thats known on earth. Superficially it looks like a centipede, and it does spend all its life swimming endlessly through the cave waters. And its nearest relatives perhaps are known only from fossils that may date back fifty million years or more." In a future program, we'll hear more about how one species of living fossil came to be found in two different caves on opposite ends of the earth. Pulse of the Planet is presented by the National Science Foundation. I'm Jim Metzner. music EARTH SCIENCE Scientist: Dr. Tom Iliffe |
