Page 12 - One Million Things: Animal Life - The Incredible Visual Guide

1 PORIFERA 2 CNIDARIA 3 WORMS 4 ARTHROPODA
There are 5,000 species of sponge, all Corals, sea anemones, jellyfish, Animals that have long, soft bodies This is the biggest animal group, with
of which live either in the sea or fresh and their relatives make up the and no legs are commonly referred well over a million known species.
water. As larvae they drift until finding Cnidaria. Mostly marine animals, to as worms, yet they belong not to All arthropods have a tough outer
a suitable place to settle, then stay some swim or float freely while one but several distinct phyla. exoskeleton or cuticle covering their
fixed to that spot as adults. Sponges others, including anemones, are Phylum Annelida includes worms distinct head and body segments,
are the simplest of all animals, with anchored to rocks. Many are with bodies divided into segments, and legs with joints. The main
no regular shape. They feed by carnivores that capture prey such as earthworms, leeches, and arthropod groups are the insects,
filtering out food particles from a using their stinging tentacles. Some ragworms. Phylum Platyhelminthes the crustaceans, such as crabs and
current of water that they draw in Cnidaria species are actually colonies includes the flatworms, with their crayfish, and the arachnids, which
through pores (holes) in their body. of many individual organisms. flattened, ribbonlike bodies. feature spiders and scorpions.

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ANIMAL KINGDOM

The animal kingdom contains an extraordinary variety
of different species, which can be arranged into 34 groups called
phyla. Just one of these phyla, the Chordata, includes all vertebrates
(animals with backbones, such as fish, ferrets, and frogs). The other
more than 30 phyla contain 97 percent of known animal species, and
are known collectively as invertebrates (animals without backbones),
even though they are distantly related and share few common features.
Here are some of the animal kingdom’s main phyla.

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