Cephalothorax

Definition

Cephalothorax is a body part in certain arthropods where the head and thorax are fused together. It is commonly found in arachnids and crustaceans, providing structural support and housing vital organs.

5 Must Know Facts For Your Next Test

1. The cephalothorax contains the eyes, mouthparts, and major sensory organs.
2. In spiders, the cephalothorax connects to the abdomen via a narrow pedicel.
3. Crustaceans like crabs and lobsters have a carapace that covers their cephalothorax for protection.
4. The fusion of the head and thorax into a cephalothorax allows for more efficient movement and coordination of appendages.
5. Respiratory structures such as gills or book lungs can often be found within or attached to the cephalothorax.

Review Questions

Related terms

Carapace: A hard shell covering the dorsal side of some arthropods' cephalothoraxes.

Pedicel: A narrow segment connecting the cephalothorax to the abdomen in spiders.

Book Lungs: Respiratory organs found in some arachnids housed within the cephalothorax.