Variants of a mold are catalogued separately, so each one has its own sets and minifigs. Check these too if something you expect is missing here.

• 98172 Animal Body Part, Dinosaur, Triceratops / Ankylosaurus Leg, Left, Rear / Hind, with Pin [Plain] this part is a print of it
• 11893pr0003 Animal Body Part, Dinosaur, Triceratops Body with Dark Bluish Grey Top, Dark Red Markings Pair of this part