acoelomates
animals that have NO body cavity
Acoelomates are a group of animals that lack a coelom, which is a fluid-filled body cavity between their gut and body wall. As they do not have a coelom, the space between their digestive tract and body wall is filled with tissue rather than a fluid. This group of animals includes flatworms, which are also referred to as Platyhelminthes.
Flatworms have a flattened body shape, which allows them to live in aquatic environments such as freshwater, saltwater, or damp terrestrial environments. They are relatively simple animals, lacking specialized respiratory, excretory, or circulatory systems. Flatworms also do not have specialized structures for gas exchange such as lungs. Instead, gases are exchanged between the animal and its environment through simple diffusion.
Despite their simplicity, flatworms have a range of feeding strategies. Some species are parasitic, feeding on the fluids or tissue of another organism. Others are free-living predators or scavengers and consume small animals or feed on decaying organic matter.
In summary, acoelomates are animals that lack a coelom, including flatworms, which have a flattened body shape and a range of feeding strategies.
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