What is the condition of arthropod's coelom called.?

The condition of an arthropod's coelom is referred to as a "hemocoel." In arthropods, the hemocoel functions as a primary body cavity filled with blood (hemolymph), which facilitates the circulation of nutrients and waste products. Unlike in other animals with true coeloms, the hemocoel is not lined by mesodermal peritoneum and is part of an open circulatory system.