King Crab

My niece with king crab

From Wikipedia:

King crabs or stone crabs . . . are found chiefly in deep waters and are adapted to cold environments. They are composed of two subfamilies: Lithodinae, which tend to inhabit deep waters, are globally distributed, and comprise the majority of the family's species diversity; and Hapalogastrinae, which are endemic to the North Pacific and inhabit exclusively shallow waters. 

King crabs superficially resemble true crabs but are generally understood to be closest to the pagurid hermit crabs. This placement of king crabs among the hermit crabs is supported by several anatomical peculiarities which are present only in king crabs and hermit crabs, making them a prominent example of carcinisation among decapods. Several species of king crabs, especially in Alaskan and southern South American waters, are targeted by commercial fisheries and have been subject to overfishing.

I liked this explanation of carcinisation:

Carcinisation is a form of convergent evolution in which non-crab crustaceans evolve a crab-like body plan. The term was introduced into evolutionary biology by Lancelot Alexander Borradaile, who described it in 1916 as "the many attempts of Nature to evolve a crab"

Overfishing can be a problem. From Google:

Alaska's commercial king crab harvest for the 2025/2026 season has a Total Allowable Catch (TAC) of 2.68 million pounds for Bristol Bay red king crab. For the Aleutian Islands golden king crab, the total quota is set at 4.19 million pounds.