Arthropleura

About 2 metres (6.5 feet) long, possibly up to 2.63 metres (8.6 feet). That makes it the largest known land arthropod of all time.12

It probably ate dead plants and other detritus, like modern millipedes. It did not have venom fangs or legs for catching prey.5

No, it was a giant millipede, not a dinosaur. It lived long before the dinosaurs, from about 344 to 292 million years ago.1

It may have been amphibious, meaning it could live both on land and in water. It lived in open, sparsely wooded areas near water.1

Probably only about 4 km/h (2 mph), a slow walking pace. This is a guess: it was a giant millipede with short legs, and its trackways show it did not hurry.5

Yes, and scientists recently used special scanners to see its head in detail. It had antennae, mandibles, and two pairs of maxillae.2

It died out around 292 million years ago, during the early Permian period.1

It lived in what is now Europe and North America, in open, sparsely wooded forests near water.1

It is a millipede, but its head has features of both millipedes and centipedes, showing it was a mix of both groups.5

One large fossil suggests it weighed about 50 kilograms (110 pounds), as heavy as a small human.1