Pygidium

Definition

The posterior (rear) portion of the body in some arthropods, such as insects and certain crustaceans, often bearing sensory organs and sometimes modified into specialized structures like cerci in insects or a telson in crustaceans.

Etymology

From Greek 'pygidion', meaning 'small rump'.

Example

The pygidium of a scorpion is often covered with sensory hairs that help detect vibrations.

Related Terms

• Abdomen
• Sensory organs
• Cerci
• Telson

Usage Notes

The term pygidium specifically refers to the rearmost segment of the body, distinct from other abdominal segments or body parts.