1. In certain instances the dactylus , together with the propodus, form the claw. 2. In crustaceans, the dactylus is the seventh and terminal segment of their thoracic appendages. 3. The Greek and Latin words ???????? and " dactylus " are themselves dactyls ( and hence autological ). 4. The eight manus ( proximal part of the club ) and the dactylus ( distal part of the club ). 5. The claw of a lobster or crab is formed by the articulation of the dactylus against an outgrowth of the propodus. 6. The fixed finger ( pollex ) of the claw possesses a large tooth that fits into a groove in the movable finger ( dactylus ). 7. The other pereiopods are covered with rows of short stiff setae; the dactylus of each is black towards the tip, and ends in a sharp point. 8. The "'dactylus "'is the tip region of the tentacular club of cephalopods and of the leg of some crustaceans ( see arthropod leg ). 9. The first pereiopod is modified into a strong cheliped ( claw-bearing leg ) : the claw's fingers, the dactylus and propodus, are black at the tips. 10. ""'Pterygia dactylus " "'is a species of sea snail, a marine gastropod mollusk in the family Mitridae, the miters or miter snails.