Latest Placoderms Stories
The mode of reproduction seen in modern sharks is nearly 400 million years old. That is the conclusion drawn by Professor Per Erik Ahlberg, Uppsala University, from his discovery of a so-called "clasper" in a primitive fossil fish earlier this year. The research results are published today in Nature.
New research published Wednesday shows that sex has been around for much longer than many scientists had previously believed, with internal fertilization prevalent among prehistoric fish living on tropical reefs during the Devonian period 380 million years ago.
Scientists in Australia reported Thursday they had discovered the remains of the oldest vertebrate mother ever found. The fossilized 375-million-year-old placoderm fish was found in the Gogo area of northwest Australia.
By Jeremy Manier, Chicago Tribune Nov. 29--A fearsome mega-predator of the ancient seas had the most powerful jaws of any fish that ever lived, according to a new study that makes even the biggest great white shark seem like a slack-jawed weakling.
U.S. scientists have determined a prehistoric sea monster had the most powerful bite of any creature yet known: up to 80,000 pounds per square inch. Scientists have known for years the fish -- Dunkleosteus terrelli -- was a dominant predator about 400 million years ago.
CHICAGO _ A fearsome mega-predator of the ancient seas had the most powerful jaws of any fish that ever lived, according to a new study that makes even the biggest great white shark seem like a slack-jawed weakling.
- A small wooded valley; a dell.
- The protecting weather-shed built around the entrance to a house.