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Difference Between Acoelomate and Coelomate

Main Difference

The main difference between Acoelomate and Coelomate is that the Aacoelomate is an invertebrate that does not have an actual coelom cavity, whereas the Coelomate is an invertebrate or vertebrate that has an actual coelom cavity.

Acoelomate vs. Coelomate

Acoelomate does not possess a coelom body cavity; on the other hand, coelomate possess a coelom body cavity. Acoelomate includes only invertebrates; on the flip side, coelomate consists of both vertebrates and invertebrates. Acoelomate is the protostomes; on the other hand, coelomate can be protostomes or deuterostomes.

In acoelomates, mesoderm converts into the internal organs; on the other hand, in coelomates, mesoderm converts into internal organs, tissues, and coelom. Acoelomate is usually deficient in the highly specialized organ system; on the other hand, coelomate usually consists of highly specialized organ systems. Acoelomate only contains the digestive cavity; on the coelomate contains the coelom and digestive cavity.

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Acoelomate is the unsegmented animals; on the flip side, coelomate is the segmented animals. Acoelomate does not contain fluid in which internal organs can be embedded; on the other hand, coelomate contain coelomic fluid in which internal organs embedded.

Acoelomate does not cushion effect; on the flip side, coelomate has a cushion effect. Acoelomate includes ribbon worms, tapeworm, flukes, and planarians; on the other hand, coelomate includes Chordata, Echinoderms, Mollusca, etc.

Comparison Chart

AcoelomateCoelomate
Acoelomate does not contain coelom cavityCoelomate contains a coelom cavity.
Vertebrates or Invertebrates
It contains only invertebratesIt contains both vertebrates and invertebrates
Protostomes or Deuterostomes
It is only protostomesIt can be protostomes or deuterostomes
Mesoderm
Mesoderm develops into internal organsMesoderm develops into internal organs, tissues, and coelom cavity
Developed Organ System
It does not contain highly specialized organ systemIt contains highly specialized and comparative organ system
Body Cavity
It contains the only a digestive cavityIt contains many true body cavities like coelom
Cushion Effect
Its internal organs not embedded in the fluidIt contains the coelomic fluid in which internal organs embedded
Segmentation
It is the unsegmented animalsIt is the segmented animals
Examples
It includes flukes, planarians, tapeworms, ribbon worms like PlatyhelminthesIt includes Chordata, Echinoderms, Ectoprocta, Mollusca, etc.
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What is Acoelomate?

Acoelomate is the type of invertebrate containing the three germinal layers, but a true body cavity like coelom is absent in it. It means if it does not have a true body cavity, then it will also be deficient in containing the coelomic fluid in which normally internal organs are immersed. But it also contains a body cavity like the digestive cavity.

The middle germinal layer is known as mesoderm, which mainly converted into the internal organs of the body. In addition to the mesoderm, it also contains two other layer names as the endoderm and ectoderm as the inner and the outer layer, respectively. Acoelomate is deficient in the highly specialized organ system. Like coelom, it also does not contain a body system like cardiovascular and respiratory systems.

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It has the flat and unsegmented body in which the gaseous exchange occurs by simple diffusion mechanisms. It contains a simple digestive system, and the removal of wastes in the body occurs by the specialized cells and tubules. Acoelomate contain some sensory organs that can detect sunlight or food sources as well.

Acoelomate include only protostomes. It also lacks the highly specialized mechanisms for the absorption, transfusion, and excretion of substances. It just contains some specialized cells and tubules for these processes. The most common process is the simple diffusion mechanism through which the gaseous exchange occurs. The examples are Platyhelminthes like flukes, planarians, ribbon worms, tapeworms, etc.

What is Coelomate?

Coelomate can be a vertebrate or invertebrate possessing the bilateral symmetry. It also contains the coelom as an actual body cavity. If it has a true body coelom, then it will also have coelomic fluid in which the internal organs, tissues, and digestive cavity immersed. Coelomate also contains three germinal layers in which the middle one known as the mesoderm changes into internal organs and tissues. The other two layers, such as endoderm and ectoderm as an inner and outer layer, respectively.

Based on the embryonic development, coelomates divides into schizocoelom, enterocoelom, and haemocoelom. Schizocoelom usually derived by the splitting of the mesoderm. Enterocoelom derived from the embryonic gut wall. Haemocoelom is a body cavity containing blood that is present only in arthropods and mollusks. Coelomate contains highly specialized and comparative organ systems like the cardiovascular and the respiratory systems.

Its body is quite segmented, and the processes of absorption, transfusion, and excretion occur by special means. Different groups contain different mechanisms for the removal of wastes from their body such as the Arthropods contain the Malpighian tubules that linked with the digestive system are involved in the removal of wastes from the body of insects.

Coelomates includes both protostomes and deuterostomes. Coelomates contain highly specialized sensory organs like ear, skin, ears, ganglions, etc. It helps with the reception of light, chemicals, sounds, other waves. They can seek for the food. The examples of coelomate include Chordata, Echinoderms, Arthropods, Mollusks, etc.

Key Differences

  1. Acoelomate does not contain coelom; on the other hand, Coelomate contains coelom.
  2. Acoelomate lacks a highly specialized organ system; on the flip side, Coelomate contains a highly specialized and comparative organ system.
  3. In Acoelomate, mesoderm changes into internal organs only; on the other hand, in Coelomate, mesoderm changes into internal organs, tissues, and digestive tract.
  4. Acoelomate includes unsegmented animals; on the flip side, Coelomate includes segmented animals.
  5. Acoelomate does not have a cushion effect; on the other hand, Coelomate has a cushion effect.
  6. Acoelomate is the protostomes; on the flip side, Coelomate can be protostomes or deuterostomes.
  7. In Acoelomates, internal organs not immersed in the fluid; on the flip side, in Coelomates, internal organs and tissues are immersed in the coelomic fluid.
  8. The examples of Acoelomate are Platyhelminthes like flukes, planarians, tapeworms, and ribbon worms; on the other hand, examples of Coelomate include Chordata, Mollusca, Annelida, and Echinoderms, etc.
  9. Acoelomate does not contain coelomic fluid; on the other side of the coin, Coelomate contains coelomic fluid.

Conclusion

The above discussion concludes that Acoelomates include only invertebrates, whereas the Coelomates include both the invertebrates or vertebrates.

Janet White

Janet White is a writer and blogger for Difference Wiki since 2015. She has a master's degree in science and medical journalism from Boston University. Apart from work, she enjoys exercising, reading, and spending time with her friends and family. Connect with her on Twitter @Janet__White