Biology Worksheet: Arthropods (Page 2 of 3) in pdf

KEY

the wings pink

. An additional body part can be seen on the grasshopper, and covering near the wings that is

hard and protective called the carapace - color the carapace brown

Arachnids

Arachnids are a group of arthropods that include spiders and ticks. They have two body parts: the

cephalothorax (head-middle) and the abdomen. Color the cephalothorax orange

and the abdomen green

Arachnids have 8 legs, instead of the 6 you find in insects. Color the legs blue

. Notice that arachnids do not

have antennae, but you can see the mandibles on the spider pictured, you should have already colored the

mandibles purple.

Crustaceans

Crustaceans are a group of arthropods that mainly live in the water; they include lobsters, crabs, shrimp and

crayfish. Crustaceans usually have two body segments, the cephalothorax (orange)

and the abdomen

(green).

The number of appendages on crustaceans can vary, and many of them have large claws, used for capturing

prey. Color the claws on the lobster brown

and the large legs attached to the thorax blue

. Notice the

little legs attached to the abdomen on the lobster which the animal uses for swimming. These appendages are

called swimmerets - color them dark blue

. Crustaceans also have antennae - color grey.

Centipede

This animal belongs to an entirely different class from the others. Centipedes have long flat bodies and many

legs. In fact, the word "centipede" means "hundred legs", though centipedes can actually have more or less

than a hundred. Color the legs of the centipede blue

and each of its body segments red

and the

antennae grey

. Centipedes are often poisonous and are related to the non-poisonous millipede.

Questions:

1. How many body segments does an insect have? _3_ How many legs? _6_

2. How many body segments does an arachnid have? _2_ How many legs? _8_

3. Which groups of arthropods have antennae?

___trilobita, crustacea, and uniramia,

___

4. What part of the body can you see segmentation? __thorax_

5. What are the chewing mouthparts of arthropods called? __mandibles__

6. To what part of the body do the wings attach? __thorax__

7. The head and thorax are fused together in some arthropods to form the __cephalothorax__

8. What does the word "centipede" mean?

___one hundred

legs___

Biology Worksheet: Arthropods Page 2

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