Animals That Don’t Have a Heart

Some animals like jellyfish lack a heart, relying on diffusion to circulate nutrients and oxygen.

Sea sponges do not have a heart; they use pores and channels to filter water and obtain nutrients.  

Flatworms, including planarians, lack a heart and circulate nutrients through a branching gut and body tissues. 

Sea cucumbers, echinoderms like starfish, do not have a heart, using their water vascular system instead.

Corals, a type of cnidarian, don’t have a heart and rely on water flow to distribute nutrients.

Tapeworms are heartless parasites that absorb nutrients directly from their host's digestive system.

Hydras, tiny freshwater organisms, lack a heart, relying on their simple body structure for nutrient distribution.  

Nematodes, or roundworms, have no heart, circulating nutrients through a pseudocoelom filled with fluid.

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