Largest arthropod ever

Largest arthropod ever
Arthropleura armata
2.6 metre(s)
United Kingdom
21 December 2021

The largest ever arthropod (jointed-limbed invertebrate) to live on Earth currently known is a gigantic millipede called Arthropleura armata, whose total length was up to 2.6 metres (8 feet 6 inches) and with a width exceeding 0.45 metres (1 foot 5 inches). It weighed around 50 kilograms (110 pounds), its multi-segmented body was heavily plated, and possessed between 32 and 64 legs. Arthropleura lived approximately 345 to 295 million years ago, from the Lower Carboniferous Period to the Lower Permian Period, in land areas that are now the UK, Germany and north-east North America. The reason why it was able to grow so large is that, back then, the percentage of oxygen present in the atmosphere was considerably higher than it is today, thereby enhancing the creature's respiratory efficiency.