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Invertebrates are animals that neither develop nor retain a vertebral column (commonly known as a spine or backbone), which evolved from the notochord. It is a paraphyletic grouping including all animals excluding the chordate subphylum Vertebrata, i.e. vertebrates.
invertebrate, any animal that lacks a vertebral column, or backbone, in contrast to the cartilaginous or bony vertebrates. More than 90 percent of all living animal species are invertebrates.
Invertebrates are animals that do not possess a vertebral column (spinal column or backbone). This includes all animals outside the subphylum Vertebrata.
Invertebrates are animals without a backbone or bony skeleton. They range in size from microscopic mites and almost invisible flies to giant squid with soccer-ball-size eyes. This is by far the...
What are invertebrates. Learn their size, lifespan, classification, evolution, and reproduction with pictures.
Explore facts and photos about invertebrates found in and around the United States. Learn about their range, habitat, diet, life history, and more.