pereions
/pəˈriːɑnz/
noun
- The segments of the thorax in crustaceans, such as crabs and lobsters, that bear walking legs.
- Each of the pereions in this lobster species has a pair of walking legs.
- In crabs, the pereions are fused with the carapace for protection.
- The biologist carefully examined the pereions of the shrimp under the microscope.