Invertebrates are animals that neither possess nor develop a vertebral column (commonly known as a backbone or spine), derived from the notochord. This includes all animals apart from the subphylum Vertebrata. Familiar examples of invertebrates include arthropods (insects, arachnids, crustaceans, and myriapods), mollusks (chitons, snails, bivalves, squids, and octopuses), annelids (earthworms and leeches), and cnidarians (hydras, jellyfishes, sea anemones, and corals).

The majority of animal species are invertebrates; one estimate puts the figure at 97%. Many invertebrate taxa have a greater number and variety of species than the entire subphylum of Vertebrata.

Some of the so-called invertebrates, such as the Tunicata and Cephalochordata are more closely related to the vertebrates than to other invertebrates. This makes the invertebrates paraphyletic, so the term has little meaning in taxonomy.

Large blueberry hermit crab on the beach - Nature Stock Photo Agency
Ghost crab caught a sand bee - Nature Stock Photo Agency
Red swamp crayfish showing off - Nature Stock Photo Agency
Ghost crab with a bee - Nature Stock Photo Agency
Crayfish showing its scissors - Nature Stock Photo Agency
Ghost crab on the lookout - Nature Stock Photo Agency
Red swamp crayfish posing with lifted scissors - Nature Stock Photo Agency
Ghost crab near his shelter - Nature Stock Photo Agency
Gold ring cowrie on the reef - Nature Stock Photo Agency
Ghost crab caught a bee - Nature Stock Photo Agency
Ghost crab looking for a prey on the beach - Nature Stock Photo Agency
Textile cone on reef top - Nature Stock Photo Agency
Ghost crab on the beach - Nature Stock Photo Agency
Textile cone on the reef - Nature Stock Photo Agency
Portuguese man o war with tentacle view - Nature Stock Photo Agency
Ghost crab walking walking the beach - Nature Stock Photo Agency
Ghost crab eating a bee - Nature Stock Photo Agency
Land snail crawling over wood - Nature Stock Photo Agency
Giant African land snail passing by - Nature Stock Photo Agency
Male stag beetle climbing on bark - Nature Stock Photo Agency
Zebra longwing (Heliconius charithonia) on a flower - Nature Stock Photo Agency
Tiger heliconian butterfly closeup - Nature Stock Photo Agency
Great capricorn longhorn beetle closeup - Nature Stock Photo Agency
Male stag beetle on a tree - Nature Stock Photo Agency
Stag beetle closeup with moss - Nature Stock Photo Agency
Stag beetle, Veluwe The Netherlands - Nature Stock Photo Agency
Portuguese Man O War - Nature Stock Photo Agency
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