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 …

Jan 17, 2026 · 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.

What are invertebrates. Learn their size, lifespan, classification, evolution, and reproduction with pictures.

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...

Only the subphylum of Chordata called Vertebrata contains any vertebrate animals. Some invertebrates have a hard exoskeleton, or shell, like snails, crabs, or mussels. The majority have compound eyes …

Jul 23, 2025 · Invertebrates are the largest group of animals in the animal kingdom having no vertebral column or backbone. They are the most diversified group of animals living on land like insects, …