Bone-like joint or plate, especially
one of numerous small calcareous structures forming the skeleton of certain echinoderms, as the starfishes;
one of the hard articuli or joints of the stem or branches of a crinoid or encrinite;
A small bone (or bony structure), especially one of the three of the middle ear.
one of the several small hard chitinous parts or processes of the gastric skeleton of crustaceans, as in the stomach of a lobster or crawfish.
The skeleton of echinoderms is made of ossicles, linked to each other via muscles and connective tissue.
The inner and usually the larger of the two bones of the leg or hind limb below the knee
A segment of an insect's leg.