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Actually most animals (over 90%) lack a backbone. The animal kingdom is seperated to many phyla. Almost all of them lack a backbone and so are called "invertibrate". The proifera phyla has sponges. The cnidaria phylum has coral, sea anemones and jellyfish. The molluska phylum has snails, clams and octopus. There are several phyla for worms, such as platyhelminthes (flat worms), annelida (segmented worms) and nematoda (round worms). Most animal species belong in the arthopoda phylum, which has centipeds, millipedes, aracnids and crustaciens. One of its classes, insects, make up over half the animal species. Then the echinodermata phylum has sea urchins, sea stars and sea cucumbers. Finally there is the single cordata phylum. Some of the members lack a true spine, like lancelets and sea squirts. Others are the vertibrites, which are all the animals that do have a backbone. They include humans, other mammels, reptiles, birds, amphibians and fish. Seperating the animal kingdom to invertibrates and vertibrites is no longer very relevent to zoology.
Wiki User
∙ 12y ago
Wiki User
∙ 11y agoinvertabrates
Edit:
The correct spelling of the answer is invertebrates.
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