cephalothorax

A crab's cephalothorax is covered by a hard carapace.

Definition

1. Noun:
   • Anatomical structure in arthropods: "Cephalothorax" refers to the fused head and thorax region found in certain arthropods, such as spiders, crustaceans, and scorpions. This combined body part contains the eyes, mouthparts, and legs.

Usage Examples

• Noun:
  • The spider's cephalothorax is covered in a hard exoskeleton. (The fused head and thorax of the spider.)
  • In crabs, the cephalothorax houses the brain and the gills. (The combined head and thorax region of the crab.)

Advanced Usage

• "Cephalothorax" in taxonomy: In arachnology and carcinology, the term is used to describe the prosoma, the anterior body segment of chelicerates and crustaceans.
  • The cephalothorax of a scorpion is divided into a carapace and a sternum. (The fused head and thorax of the scorpion has distinct top and bottom plates.)

Variants and Related Words

• Cephalothoracic (adj): relating to or affecting the cephalothorax.
  • The cephalothoracic muscles are responsible for leg movement. (The muscles in the fused head and thorax region.)
• Prosoma (n): a synonym for cephalothorax, especially in arachnids.
  • The prosoma of a tarantula contains the chelicerae and pedipalps. (The fused head and thorax of a tarantula.)

Synonyms

• Prosoma: the anterior body segment of arthropods, equivalent to the cephalothorax.
• Cephalic thorax: a less common term for the fused head and thorax.

Related Idioms

• None: "Cephalothorax" is a specific anatomical term and does not appear in common idioms.