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The Animal Kingdom (Invertebrates (Phylum Arthropoda (Arthropods)
The…
The Animal Kingdom
Invertebrates
Phylum Mollusca (Molluscs)
Molluscs have bilateral symmetry, three layers of cells, a coelom, two body openings, a soft body that is protected in many species by a hard shell.
Class Bivalvia (Clams, Mussels, Oysters, and Scallops)
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Phylum Echinodermata (Echinoderms)
They are marine animals with radial symmetry, spiny endoskeletons and tube feet. They have a water-vascular system, and uses their muscles to force water into the tube feet, making them extend their body.
Phylum Cnidaria (Cnidarians)
Cnidarians are one of the oldest animal groups. They only have two layers of cells, but do have tissues as well as a simple nervous system. They have radial body symmetry and two basic body forms.
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Phylum Porifera (Sponges)
Found in both marine and freshwater environments, they have an asymmetrical body plan and no tissues or organs. Their bodies consist of only two layers of cells.
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Phylum Arthropoda (Arthropods)
The largest animal phylum. They are characterized by having legs made up of movable sections connected by joints, and also have a body divided into segments and a hard exoskeleton that is periodically shed or moulted,
Chelicerates (Spiders, Mites and Scorpions)
- Two body segments - a cephalothorax and abdomen
- Six pairs of jointed appendages
- No antennae
- Special appendages for feeding
- Some are poisonous
Myriapods (Millipedes and Centipedes)
- Each segment has one of two pairs of legs
- Have a single pair of antennae and, in most cases, simple eyes
- Live in moist habitats, under logs or stones
- Centipedes are poisonous
- Millipedes are not poisonous
Crustaceans (Crabs, Lobsters, Shrimp, and Barnacles)
- Five pairs of jointed appendages
- Two pairs of antennae
- Have fewer body segments, with a tendency for segments in the head and thorax regions to fuse and become specialized
Insects (Beetles, Bees, Butterflies, Moths, and Flies)
- Three body segments - head, thorax, and abdomen
- Three pairs of legs
- One of two pairs of wings, or no wings
- Mouthparts specialized for siphoning, piercing, sucking and chewing
Phylum Chordata (Vertebrates)
They have a notochord and a dorsal nerve chord. In Vertebrates, the notochord forms the embryo and the nerve chord becomes the brain and spinal chord, which are eventually enclosed in the skull and spine respectively
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