570 vanished lives

210Paleozoic

Flattened swimming paddles and great toothed claws made it a formidable hunter in Silurian water.

221Mesozoic

This lightly built two-meter hunter represents an early branch from the first dinosaur diversification.

251Paleozoic

Its antennae, gills and clawed legs reveal far more than a mineralized trilobite shell.

252Paleozoic

Robust leg bases formed crushing jaws for small trilobites and other shelled prey.

253Paleozoic

Two large shields covered a soft body equipped with fully segmented trilobite-like limbs.

254Paleozoic

A bivalved carapace, compound eyes and mandibles reveal an early mandibulate; some fossils preserve embryos under the carapace.

255Paleozoic

At nearly seventy centimeters, it is among the largest complete trilobites ever found.

256Paleozoic

Its long pincers carried slanting blades suited to holding or slicing soft prey.

301Precambrian

Its quilted branches lay flat rather than rising from a stem.

302Precambrian

Dense stands of narrow tubes formed one of the earliest large colonial scenes.

303Precambrian

Bead-like discs arranged in strings may record an early macroscopic colony.

308Paleozoic

A flower-bud body carried five feeding and respiratory grooves.

309Paleozoic

Radiating septa inside a horn-shaped skeleton resemble a stone sun.

310Paleozoic

Linked tubes formed honeycomb chains across Paleozoic reefs.

311Paleozoic

Fine radial ribs covered rounded shells that once crowded ancient seabeds.

312Paleozoic

A broad hinge line formed stone wings that stabilized the shell on soft mud.

313Mesozoic

Its adult shell stretched into a near-straight rod while retaining ammonite sutures.

314Mesozoic

A huge internal shell identifies a large coleoidean, though total length remains uncertain.

315Mesozoic

The juvenile shell coiled tightly before the adult chamber uncoiled and hooked back.

429Paleozoic

A two-meter filter-feeding radiodont was an early analogue of giant plankton feeders.

430Paleozoic

A horseshoe-shaped carapace and rake-like appendages made a mobile sediment sifter.

431Paleozoic

An enormous head shield covered most of this bottom-feeding radiodont.

432Paleozoic

Isoxys curvirostratus was a small arthropod with a spined carapace, stalked eyes and grasping frontal appendages.

433Paleozoic

A broad head, long genal spines and many trunk segments marked an early trilobite radiation.