Invertebrates are animals that have no backbone.

There are more than 1 million kinds of arthropods on Earth.

An arthropod is an invertebrate with an exoskeleton, a segmented

body, and jointed legs.

crayfish

• The body segmented, the segments usually grouped in two or three rather distinct regions.

• ex. 3 regions- Head, thorax, abdomen • (beetle)• ex. 2 regions- Cephalothorax (fused head & • thorax) and abdomen• Exoskeleton ( called a carapace in crayfish) made

of chitin.• Paired segmented appendages.

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An exoskeleton is a hard, outer covering made of chitin.

Molting is to leave an exoskeleton and grow a new one.

A crustacean is an arthropod that has a hard, exoskeleton, two pairs of

antennae, and a mouth for crunching and grinding.

Crustaceans can ________ certain parts of their body.

A ___________ can re-grow its claws.

Most crustaceans live in ______ and get oxygen from the water through _________.

Gills are

Digestion

• Tube from the mouth to the anus. • Divided into sections: the foregut, the

midgut and the hindgut.

• Anterior ganglion or brain and paired nerve cords.

• Some have developed sensory ability.

• Have an open circulatory system.• Blood is often green since it does not have

hemoglobin. It has hemocyanin which contains copper. Cu + O2 = green

• The heart is a simple tube running along the back.

Respiratory System

• Respiration by means of gills, or book lungs and spiracles.

Reproduction

• The sexes nearly always separate.• Fertilization is usually internal in land

species but external in aquatic species.

Excretion

• Passes waste out of its anus from the hindgut.

• No nephridia.

* Centipedes and millipedes are arthropods that have many legs.

* Have _______ pair of legs in each segment.* Are carnivores and eat _________.

* To capture its prey, a centipede puts _______ into the prey’s body with its_______.* Centipedes are found in ___________ like under rocks and in the soil.

* Centipedes and millipedes are arthropods that have many legs.

* Have ___ pairs of legs on each segment.* Eat _________ and are shy animals. * When scared, it _________________ to protect itself.

* Are found in __________like under rocks and in the soil.

* Do not have ________.

* All have __________ legs.* Have a body divided into two parts:

•______________________________•________________________________

* Spiders usually eat __________, but some spiders eat small _______________ like hummingbirds. * Many spiders make webs out of _________.

* Silk is _________________________________.

* Spiders catch their prey in many different ways.

* Some spiders catch their prey in ____.

* Some spiders ________ from their prey and then ________________________.

* When spiders catch their prey, it _______ it and _________ it.* Spiders breathe oxygen with __________.

* Scorpions usually live in __________ areas.* Most scorpions are __________________.** Nocturnal means ____________________* During the day, scorpions hide __________ ______________________________.

* When scorpions capture prey, they _______ ___________________________________.

* Ticks and mites live on _______________.* Some ticks and mites suck juices from ____________________. * Other ticks and mites are very tiny and live on __________.

* Many ticks suck the blood from _________.

* Ticks can give animals a ____________.

*There are more kinds of insects than there are all other animal species all together.* There could be _______________ times as many insects as humans on Earth.* Insects have a body that is divided into ____ parts. * An insect’s body is divided into a ________, a _____________, and a ___________ area.

* Insects have _____ legs connected to the chest part.* Some insects’ legs are all the same size. Some insects have one pair of legs larger than the other two pairs.* A grasshopper has one pair of legs larger than the other two pairs. These larger legs are used for ____________.

Longer back legs

* Insects eat a lot, so they grow very fast. As they grow, insects may molt and grow new ___________, or they may change completely.

* A huge change in appearance is called ________.

* There are two kinds of metamorphosis: ______________ and ______________.

* In complete metamorphosis, insects like butterflies and moths have _______ stages of development.* The first stage makes an ________.* During the second stage, the egg hatches and a _________ comes out. * A caterpillar is the larva of an insect that will become a butterfly or a moth.

* During the third stage, a ___________ is made.

* A pupa is sometimes wrapped in a _____________ or in a _______________.* A cocoon is the pupa of a _____________. A cocoon is made of ________.

* A chrysalis is the pupa of a ___________.* In the last stage, the insect is finally an adult.

* Incomplete metamorphosis happens in grasshoppers, termites, and dragonflies.* In incomplete metamorphosis, young animals that look like the ___________ hatch from eggs.* As the young animals grow, they keep _________, shedding their exoskeletons, and getting larger.

* Most insects live alone. But, some insects are ___________ and cannot survive alone.* These insects live in ______________ or hives.

* A colony is _____________________________ _______________________________________

* An amazing example of a colony is a __________.* A beehive is ___________________________.

* All insects must protect themselves.

* Bees and wasps have _______________ to protect themselves. * Many other insects use ______________.* Camouflage allows an insect to hide by ___ _______________________________.