Invertebrate

Definition

Animals that do not possess or develop a vertebral column (backbone), including insects, arachnids, mollusks, and many others.

Etymology

From Latin 'in-', meaning 'not', and 'vertebratus', meaning 'jointed' or 'having a spine'.

Example

Insects like ants and spiders are examples of invertebrates that play crucial roles in their ecosystems.

Synonyms

• Spineless animals
• Non-vertebrates

Related Terms

• Vertebrate
• Arthropod
• Mollusk
• Echinoderm
• Cnidarian

Usage Notes

Invertebrates make up the vast majority of animal species on Earth and display a remarkable variety of forms and behaviors.