arthropod tagma composed of head and thorax

The cephalothorax, also called a prosoma, is the body part of some arthropods where the head and the thorax are one.[1]

The cephalothorax is the area marked in yellow.

It is common in crustacea and chelicerates. The cephalothorax may be covered with a tough carapace.


  1. Eldra Pearl Solomon, Linda R. Berg & Diana W. Martin (2004). "The animal kingdom: an introduction to animal diversity". Biology (7th ed.). Cengage Learning. pp. 534–549. ISBN 978-0-534-49276-2.