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 …

Nov 26, 2025 · 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.

Sep 13, 2025 · Invertebrates are animals without backbones. Learn their definition, types, characteristics, classification, evolution, and importance.

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...

4 days ago · What are invertebrates. Learn their size, lifespan, classification, evolution, and reproduction with pictures.

Oct 3, 2022 · By definition, invertebrates are animals that do not develop a backbone or vertebral column, and they do not possess a notochord during development. The exception to the lack of a …

Explore facts and photos about invertebrates found in and around the United States. Learn about their range, habitat, diet, life history, and more.