Definition of opisthosoma in English:
The abdomen of a spider or other arachnid.
- The body is divided into a front part - the cephalothorax or prosoma, and a rear part, the abdomen or opisthosoma.
- The chelicerate body plan is characterized by two tagmata, the prosoma, including head structures, and the opisthosoma.
- Of the eight specimens, three are almost complete and five consist only of the prosoma and part of the opisthosoma.