the.com/crustacean
An animal that wears its skeleton outside, like a tiny knight who never takes off the armor.
means A mostly aquatic arthropod — crabs, lobsters, shrimp, barnacles, and kin — with a hard segmented shell, jointed legs, and usually two pairs of antennae.
from From Latin crusta, meaning 'rind,' 'shell,' or 'crust' — the same root that gives us 'crust' on bread. Naturalists in the 1700s–1800s needed a word for animals defined by that hard outer covering, so crustacean was formed to mean, essentially, 'the crusty ones.' The armor isn't just the essence's metaphor — it's baked right into the name.
- barnacles count
- Barnacles are crustaceans, not mollusks, surprising everyone
- growth problem
- They molt their entire shell just to grow bigger
- blood color
- Their blood runs blue thanks to copper, not iron
- closest relatives
- Genetically closer to insects than to fish