- In zoology: In Crustacea, the last segment of the normally 7-jointed leg; a dactylopodite. It is the movable claw of the two that make the nipper or chelate claw.
- In entomology, one or all of the tarsal joints which follow the first one in any insect, when, as in a bee, for example, the first joint is much larger than the rest and known as the metatarsus or planta.
- In conchology, a piddock, Pholas dactylus.
- In anatomy See digitus