Difference Between Invertebrates And Vertebrates
May 27, 2023
The main difference between invertebrates and vertebrates is that invertebrates are animals without spines, while vertebrates possess a spine. Invertebrates are occasionally (incorrectly) perceived as primitive due to their underdeveloped organs.
Invertebrates vs. Vertebrates
Here are the main difference between Invertebrates and Vertebrates:
Aspect | Invertebrates | Vertebrates |
---|---|---|
Definition | Animals without a backbone | Animals with a backbone |
Diversity | Vast majority of animal species are invertebrates | Smaller number of species compared to invertebrates |
Body Structure | Varied body structures and forms | More complex body structures and internal skeletons |
Skeletal System | Lack a bony skeleton; may have exoskeletons, shells, or no hard structure | Possess an internal skeleton made of bones or cartilage |
Nervous System | Diverse nervous system types, including nerve nets and ganglia | Possess a well-developed centralized nervous system, including a brain and spinal cord |
Reproduction | Various modes of reproduction, including sexual and asexual | Mostly sexual reproduction, with internal fertilization being common |
Size Range | Varies greatly in size, from microscopic to large sizes | Sizes range from small to very large |
Habitat | Occupy diverse habitats, including terrestrial, aquatic, and aerial environments | Found in a wide range of habitats, including terrestrial, aquatic, and aerial environments |
Exoskeleton | Have an exoskeleton | Do not possess an exoskeleton |
Circulatory System | Majority have an open circulatory system | Possess a closed circulatory system |
Eyes | Many have compound eyes | Do not have compound eyes |
Body Symmetry | Includes radial or bilateral body symmetry | All have bilateral body symmetry |
Mode of Nutrition | Autotrophic, parasitic, and heterotrophic | Usually heterotrophic |
Species Distribution | 95% of animal species are invertebrates | 5% of animal species are vertebrates |
Examples | Flatworms, arthropods, sponges, insects, worms, mollusks, jellyfish, sponges | Mammals, fish, reptiles, amphibians, birds |
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