A recent paper provides an updated perspective on the evolutionary history of chelicerates—a diverse and ecologically ...

Arachnid evolution involved multiple land transitions, not just one. Spiders and scorpions evolved key traits through gene duplication.

Those round shells and long legs give Japanese spider crabs an arachnid-like look, hence their common name. These animals also have spines behind and in front of their short eye stalks.

A captivating new species of arachnid from the late Carboniferous ... resembling the shape of a crab’s shell. These spines, often brightly colored in hues of white, yellow, red, or black ...