Four bivalve specimens from Antarctica’s Seymour Island analyzed in the University of Michigan study, showing the range of sizes of the different mollusks. Species names clockwise from the top shell: ...

An examination of an aquatic, shrimplike creature that lived half a billion years ago offers insight into how arthropods with mandibles became so common. By Rebecca Dzombak About 70 percent of the ...

Fossil shell of Pithocerithium rubiginosum (height is 1.5 cm) from the Miocene sediments of Nexing in Austria (left) and isolated reddish polyene pigments on calcium fluoride disc (diameter of disc is ...