how many hearts do butterflies have

Butterflies have a simple, open circulatory system, not a true closed heart like vertebrates. They do possess an organ often referred to as a heart, which is a long, tubular structure running along the abdomen that pumps hemolymph through the body. This “heart” beats to circulate hemolymph, but insects do not have a closed circulatory system like ours, and their blood (hemolymph) is different from vertebrate blood. So, in common terms: a butterfly has one heart (a dorsal vessel with heart-like contractions) along its abdomen, not multiple hearts. [information synthesized from entomology sources]