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. Apart from the absence of a vertebral column, invertebrates have …

Sep 13, 2025 · 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...

As the name suggests, ‘invertebrates’ are organisms that are not vertebrates, meaning they lack a vertebral column or backbone, unlike their counterparts.

Oct 9, 2025 · Invertebrate animals are those that do not have a backbone. The majority of the world's animals are found in this group, representing 95% of the existing species.

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