Rare evidence about cyclidan crustaceans has been uncovered in the USA, revealing more about how they behaved.

This fossil belongs to the euarthropods group, which includes present-day insects, spiders, and crabs. What makes it unique is the exceptional preservation of its internal organs, despite the ...

Remember, "skeletons" include bone, the protein shell of crabs or insects, the sturdy shells of clams ... material of the organism has not been changed to another substance. The fossil may have lost ...

Because of their origin 450 million years ago, horseshoe crabs are considered living fossils.

Dr. Daniel Sasson is an assistant marine scientist with the South Carolina Department of Natural Resources (SCDNR) who studies horseshoe crabs. "There are fossil remains of horseshoe crabs from ...

Horseshoe crabs first appeared in the fossil record about 450 million years ago… and zoologists are still arguing about who their closest relatives are. Until recently, the case seemed closed.

This is a reconstruction of fossil crab larva (a) ventral aspects, (b) dorsal aspects. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert!