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What’s an arthropod? An arthropod is an animal that: Isan invertebrate (has no backbone or spinal chord) Has jointed limbs Has a segmented body Has an external skeleton (exoskeleton) made of a substance called “chitin”
Arthropods Are EverywhereYou can find arthropods everywhere: in ayard, on a street, in a pond, in the sea.So what are they?This creature is an ant, whichis an insect. Insects are a kindof arthropod that have three body divisions(head, thorax, and abdomen) and six legs.The feelers on its head don’t count as legs.
This beetle has a segmented body, an exoskeleton, and six jointed legs. Is it an insect? Yes No
Most insects are larvae before they become full grown.Larvae include the grubs and caterpillarsthat you may have seen in a garden. Laterthey mature into adult insects.
Butterflies and moths are insects.They have six legs.When butterflies and moths first hatch fromtheir eggs, they are caterpillars. But they arestill insects.
When the hornworm moth is a larva, itlooks like the picture below.Is it still an insect? Yes No
Arachnids are another kind of Arthropod.This creature is Spiders are arachnids.a raft spider. arachnids are a kind of arthropod that have two body sections (cephalothorax and abdomen) and eight legs.
Scorpions are also a kind of arachnid.Besides their legs, arachnids also haveother appendages, which do differentthings, depending on the kind of arachnid.The scorpion is anarachnid that has eight legs.It also has a pair of claws.
Another common class of arthropods areCrustaceans have several body segments that crustaceans.are grouped into a head, a thorax, and anabdomen.The head and thorax may be fused intoone piece, and the whole body may becovered by a carapace. Crustaceanshave at least 10 legs.The crab on this slide is a crustacean.
You may have eaten a crustacean.Most crustaceans live in water. Lobsters,crabs, shrimp, crayfish, and barnacles arecrustaceans. A few live on land, likewoodlice.
Which animal is a crustacean? Scorpion Moth Shrimp
There are other kinds of arthropods.For example, there are the myriapods, whichinclude centipedes. Centipedes have a pairof legs for every segment of their bodies.