23 terms

Animal Classification

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Invertebrate
Animal lacking a dorsal spinal cord
Sponge
invertebrate; body has many pores; loosely joined cells, no specialized tissues.
Cnidarian
invertebrate; hollow, sack-like body; has specialized stinging cells (jellyfish, corals, etc.)
Flatworm
invertebrate; soft, flat, worm-like body; digestive system has one opening, no specialized segments
Roundworm
invertebrate; soft, round, worm-like body; digestive system has two openings, no specialized segments
Annelid
invertebrate; soft, round, worm-like body; digestive system has two openings, has specialized segments (Earthworm)
Mollusk
invertebrate; soft body, some have appendages that are "tentacles", some have hard shells (clam, snail, octopus, etc.)
Gastropod
Mollusk with a single shell or no shell, a single muscular "foot" contains the mouth. (Snail, slug, etc.)
Bivalave
Mollusk with 2 shells held together by powerful muscles (Clam, oyster, etc.)
Cephalopod
Mollusk with tentacles extending from the head (octopus, squid, cuttle-fish, etc.)
Echinoderm
spiny-skinned marine invertebrate, body divided into 5 parts (Starfish, sand dollar, sea urchin)
Arthropod
Invertebrate; has an exoskeleton and jointed legs; body is divided into sections.
Arachnid
Arthropod with 4 pairs of legs, two-segmented body (spider, scorpion, etc.)
Centipede
Arthropod with long body and many segments; two legs per segment
Millipede
Arthropod with long body & very many segments; four legs per segment
Crustacean
Arthropod with 5 - 7 pairs of legs, (crab, lobster, crayfish, shrimp, etc.)
Insect
Arthropod with 3 pairs of legs, 3-segmented body, often have wings (Grasshopper, butterfly, beetle, etc.)
Vertebrate
Animal with a dorsal spinal cord
Fish
Cold-blooded aquatic vertebrate usually having scales and breathing through gills
Amphibian
Cold-blooded vertebrate lives on land but breeds in water, lays jelly-coated eggs. (frog, salamander, etc.)
Reptile
Cold-blooded vertebrate with dry, scaly skin, lays leathery coated eggs. (lizard, snake, turtle, etc.)
Bird
Warm blooded vertebrate, has feathers & hollow bones, lays hard-shelled eggs
Mammal
Warm-blooded vertebrate, has hair or fur, females produce milk to feed their young (human, cow, whale, bat, etc.)
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