Inachus dorsettensis, commonly known as the scorpion spider crab, is a species of crab generally found on loose substrates (stony bottoms to mud) from 6 metres (20 ft) depth down to about 100 m (330 ft).

The carapace of a fully grown male is roughly 30 millimetres (1.2 in) long and slightly narrower than it is long.

[1][2] Inachus dorsettensis resembles the closely related species Inachus phalangium, but has more prominent spines on the carapace.

[1] They molt, with the intermolting period being shorter the warmer the water they reside in is.

[3] Scorpion spider crab is found along the east coast of the Atlantic Ocean from Norway to South Africa, and also in the Mediterranean Sea.