The pollex is the fixed “finger” of the claw (the movable finger is the dactyl). It is part of the manus; generally there is no specific point which delineates the pollex from the “palm” of the claw.
The pollex of the minor cheliped, from the dorsal view of the crab. Figure modified from Crane (1975).The pollex of the minor cheliped, from the vental view of the crab. Figure modified from Crane (1975).
