However, recent phylogenomic studies challenge this view, indicating that horseshoe crabs are nested within the arachnids rather than forming a separate, sister lineage. This suggests that ...
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.
One of the many kind-of crabs -- horseshoe crabs -- is a key figure in another mystery: the Case of the Land-Living Arachnids. Horseshoe crabs first appeared in the fossil record about 450 million ...