Echinoderms to arthropods
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Echinoderms to Arthropods. Mr.. King Fall 2005. Echinoderms. Echinoderms. Echinoderms. Echinoderms. Echinoderms. Echinoderms. Echinoderms. Echinoderms. Echinoderms Means Spiny Skin!!. All About the SEA STAR.

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Echinoderms to Arthropods

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Echinoderms to Arthropods

Mr.. King

Fall 2005


Echinoderms


Echinoderms


Echinoderms


Echinoderms


Echinoderms


Echinoderms


Echinoderms


Echinoderms


Echinoderms

Means Spiny Skin!!


All About the SEA STAR

  • Star Fish expel enormous numbers of eggs and sperm into the ocean. Fertilization is external. Baby sea stars travel many miles for about two months. They also reproduce by regeneration.

  • How do they eat?

  • They are carnivores and eat clams, oysters, coral fish and other animals. They push their stomach out through their mouth and digest prey.

  • The only way to kill a star fish is to dry it out. They can regenerate body parts.


Phylum Arthropods

  • These are the classes in the phylum Arthropods:

  • Crustacean

  • Insect

  • Arachnid

  • Centipede

  • Millipede


DISADVANTAGES

They are heavy, the animal can only get so big.

When the animal molts, they become venerable to prey. In other words, they might get eaten.

ADVANTAGES

They are strong against predators.

There is very little water loss.

Disadvantages and Advantages to an EXOSKELETON


Phylum ArthropodsClass Crustacean

  • Animals include: Crab, Lobster, crayfish, etc.

  • These animals have an exoskeleton made from a hard substance (like your finger nail) called chitin.

  • These animals have to “molt”, sluff off their old skeleton and grow a new one to increase in size.

Go see a crab.


All about Molting

  • The young crab is only 2 cm (1 inch) wide but it grows quickly during the summer, molting every 3 to 5 days and increasing up to 1/3 its size with each molt.

  • Molting usually does not occur from November until the first 2 weeks in April.


  • Females molt 18 to 20 times to reach their final molt, while males molt 21 to 23 times and reach a larger size.

  • When molting, the shell cracks along the back between the carapace and the abdomen. The crab or buster slowly backs out in a soft shell condition.

  • Times vary, but a 4- to 5-inch crab takes up to 2 or 3 hours to molt.

  • Over the next 9 to 12 hours, the shell has a leathery feel and is called a Paper Shell. The crab then becomes stiff and brittle during the next 12 to 24 hours.


Arthropod - Insect

  • This is the largest group of animals in the world!

  • These animals go through a metamorphosis or a change in their life cycle. The complete sequence is: egg, larva, pupa and adult

  • This groups consists of grasshoppers, mosquitoes, flies, butterflies, bees, and beetles. No spiders are in this group.

More on

This

Later!


Why are Insects so Successful?

  • 1. They have a fast reproduction rate.

  • 2. They have protective resemblance or coloration.

  • 3. They are small.

  • 4. They eat just about anything.

  • 5. They live in groups.


Four Ways Insects Eat Food

  • 1. Chewing just like the grasshopper

  • 2. Sucking like the mosquito.

  • 3. Lapping like the fly

  • 4. Siphoning like the butterfly .


How do Insects Protect Themselves

  • Protective Coloration! The insect takes on the color of their surroundings.

  • Protective Resemblance! The insect takes on the shape of their surroundings. (Take a look at the stick bug.)


Grasshopper

Arthropod Insect


Incomplete Metamorphosis - done by INSECTS


Incomplete Metamorphosis - done by INSECTS

eggs


Incomplete Metamorphosis - done by INSECTS

Young Nymph

eggs


Incomplete Metamorphosis - done by INSECTS

Young Nymph

Molt

eggs


Incomplete Metamorphosis - done by INSECTS

Young Nymph

Molt

eggs

Later

Nymph


Incomplete Metamorphosis - done by INSECTS

Young Nymph

Molt

eggs

Later

Nymph

Molt


Incomplete Metamorphosis - done by INSECTS

Grasshoppers go through this!

Young Nymph

Molt

eggs

Later

Nymph

Molt

ADULT


Complete Metamorphosis


egg

Complete Metamorphosis


Larva (mealworm)

egg

Complete Metamorphosis


Larva (mealworm)

egg

Pupa

Complete Metamorphosis


Larva (mealworm)

egg

Pupa

ADULT

Complete Metamorphosis


Larva (mealworm)

egg

Pupa

ADULT

Complete Metamorphosis

Butterflies go through this.


Arthropod , Class ARACHNIDS

  • Spiders and scorpions are part of this group.

  • They are meat eaters and suck the blood from prey.

  • They mate and reproduce sexually

  • They have two body parts instead of three like the insects.


Phylum Arthropods, Class Arachnids - animal spider


How each class of the phylum arthropod breath

  • Crustacean use gills.

  • Insects use spiracles.

  • Spiders us book lung.

  • Centipede uses spiracles.

  • Millipede uses spiracles.


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