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The main difference between invertebrates and vertebrates is that invertebrates do not have the backbone with the spinal cord, but in the case of vertebrates animals have a well developed internal skeleton of cartilage and bone.
Invertebrates vs. Vertebrates
Animals are divided into two major groups, one is the invertebrates, and the other one is vertebrates. Invertebrates are those animals that do not have a backbone, but vertebrates are those animals that have a healthy spine and internal skeleton of cartilage. Invertebrates animals are small in sizes because they do not have well-developed organ system that’s why their size remains small, but vertebrates include those animals who vary from little to larger because they have a more advanced organization of body structure. The invertebrates cover about 98% of the animal kingdom while vertebrates cover only 2%.
What are Invertebrates?
Invertebrates are those animals that belong to phylum “Animalia”; they do not have a backbone. The notochord is not developed in them. There have radial or bilateral body symmetry. They have a loosely organized nervous system. They are smaller in size than vertebrates. They move very slowly. They are multicellular organisms, and most are found in colonies. They have no cell wall but have many tissues, except in sponges. They can move freely, but they move slowly. They feed on plants and other animals; therefore they are known as heterotrophic. They are classified into further 30 phyla. They reproduce sexually. About 98% species of animals on earth are invertebrates animals.about 2 million species of invertebrates are found on the surface of the planet. Their subphylum is vertebrata. They have no clefts. In invertebrates, the heart is located in the abdomen. In invertebrates, blood temperature is the same as the temperature of the surrounding environment.they have more than two pairs of limbs — their skin consists of only one layer.
Sponges, coelenterate, echinoderms(starfish, sea urchin, sea cucumber), celebrates (ctenophore, comb jellies, and sea pens), mollusks, worms, cnidarians, worms are the example of invertebrates.
What are Vertebrates?
Vertebrates are those animals that have a firm backbone, have an internal skeleton which is called endoskeleton. Vertebrates are the more advanced organisms on this earth. Vertebrates have a developed nervous system, digestive system, and a closed blood system. They have a segmented body, and their bodies are more organized. They have only bilateral body symmetry. Vertebrates have more ability to understand because they have well-developed brain.they are bigger in size than invertebrates.they move faster than invertebrates. Vertebrates are further classified into five groups. They have pharyngeal cleft to increase the efficiency of breathing. In vertebrates, the heart is located dorsally, and the blood temperature is not the same as the temperature of the surrounding environment as compared to invertebrates.they do not have more than two pair of limbs. Vertebrates body have two layers of skin, one is epidermis and the second one is dermis.
Examples of vertebrates are raptiles, amphibians, mammals, birds, marsupial, primates, rodents, cetaceans.
- Invertebrates are animals without notochord while vertebrates are those animals who have a notochord.
- Invertebrates have no organized organ system, but vertebrates have well-organized organ system.
- Invertebrates blood do not have red blood cells, but vertebrates have red blood cells in their blood which contain hemoglobin.
- In invertebrates, eyes are actually the outgrowth of the skin, while in case of vertebrates, eyes are an outgrowth of the brain.
- All Vertebrates have a hepatic portal system, while all invertebrates do not have a hepatic portal system.
Vertebrates and invertebrates are the two major groups of animals. The main difference is, vertebrates have a backbone, complex, having organized organ system and larger in size, while invertebrates are those animals that have no backbone, simple, having unorganized organ system and smaller in size than vertebrates.