The arthropods
1 / 21

The Arthropods - PowerPoint PPT Presentation

  • Uploaded on

The Arthropods. Chapter 16. Phylum Arthropoda. Phylum Arthropoda. Largest phylum in Kingdom Animalia Anthropoda means “jointed feet” Includes lobsters, spiders, scorpions, millipedes, and insects Can be harmful or helpful Harmful: destroy crops, eat other animals’ food, spread diseases

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about ' The Arthropods' - sabin

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
The arthropods

The Arthropods

Chapter 16

Phylum arthropoda1
Phylum Arthropoda

  • Largest phylum in Kingdom Animalia

  • Anthropoda means “jointed feet”

  • Includes lobsters, spiders, scorpions, millipedes, and insects

  • Can be harmful or helpful

  • Harmful: destroy crops, eat other animals’ food, spread diseases

  • Helpful: studied by engineers; control the numbers of harmful arthropods; help plants reproduce; make wax, honey, medicine, and silk

Phylum arthropoda2
Phylum Arthropoda

  • All arthropods have:

  • Exoskeleton – their bones are outside of their body

    • Chitin – allows the bones to be tough and flexible – they bend without breaking

    • Arthropods molt – as they grow, their exoskeleton becomes too small – they outgrow the exoskeleton and throw it away

  • Jointed appendages – their legs and feet have joints (bend)

  • Body segmentation – most have 3 parts to their bodies

    • Head

    • Thorax (chest)

    • Abdomen (belly)

  • Open Circulatory System – they have a heart, but the blood goes into the body parts after leaving the heart (not veins)

  • Ventral Nervous System – Ganglia (nerves) are located near the legs and connected to the brain by one cord

Nervous system anatomy1
Nervous System Anatomy

  • Brain – located in the head

  • Ganglia – nerves in the legs

  • Ventral Nerve Cord – big nerve that connects the brain and the ganglia

  • Antennae – come out of the head and do taste, smell, and touch

  • Compound eyes – insects and crustaceans have these – able to see all around, not just a few directions

    ______ OR_________

  • Simple eyes – able to see very little, usually just light and dark

Subphylum crustacea1
Subphylum Crustacea

  • Lobsters, crabs, crayfish, shrimp

  • Kingdom Animalia, Subkingdom Invertebrates, Phylum Anthropoda, Subphylum Crustacea

  • Usually live in the water

  • Carapace – the back plate of a lobster (the front has 6 plates)

  • Scavengers: they eat anything!They grind their food into powder using the gastric mill.

  • They can regenerate (grow new parts)

  • Reproduce sexually – male gives sperm to the female in the fall, female lays eggs in the spring that hatch in the summer

Subphylum chelicerata1
Subphylum Chelicerata

  • 3 classes: Arachnida is the most importantclass

  • Arachnids have:

    • 8 legs – 2 of these are pedipalps (legs used for sensing and mating instead of walking)

    • 2 major segments

      • Cephalothorax (head-chest)

      • abdomen

    • No antennae or mandibles (jaws)

      • Have chelicerae instead (mouth that looks like fangs)

    • Respiration by book lungs

      • Breathe through their stomachs

    • Usually 4 pair of simple eyes (8 eyes)

    • Reproduce sexually – females are usually larger than males

Other arachnids
Other Arachnids

  • Scorpions, mites, and ticks

Class insecta
Class Insecta

Class insecta1
Class Insecta

  • 80% of all animals are insects (bugs)

  • There are 31 orders under Class Insecta

  • Structure of Insects:

    • Three pairs of legs (six legs)

    • Usually have wings

    • 3 segments to the body

      • Head

      • Thorax (chest)

      • Abdomen

    • One pair of sensory antennae (2 of them)

Wings of insects
Wings of Insects

  • M0st insects have 2 pairs (4) wings

  • Kinds of wings:

    • Membranous wings: thin, transparent (see through) – most common kind of wing - like a dragonfly or a bee

    • Scale-covered wings: butterflies and moths

Wings of insects1
Wings of Insects

  • Continued:

    • Leatherlike wings: extra set of wings that protects the wings used to fly – like a cover for wings – grasshoppers have these

    • Horny wings: ladybug wings – thick, protect the smaller wings, cover the back of the bug

Digestion eating of insects
Digestion (eating) of Insects

  • Mouth:

    • Upper lip - labrum

    • Mandibles - used for chewing

    • Maxillae – put food into the mouth

    • Lower lip – labium

  • Stomach:

    • Foregut – behind the mouth – this is where salivary glands get the food wet with spit before going to the gizzard to be ground up into powder

    • Midgut – where the stomach is – gastric cecaput more digestive juices onto the food

    • Hindgut – place right before the food is excreted (pooped)

Respiration circulation excretion and reproduction
Respiration, Circulation, Excretion and Reproduction

  • Respiration: insects breathe in their abdomens through tubes called spiracles

  • Circulation: the insects heart pumps blood into the abdomen, where it covers the organs – no veins

  • Excretion: Malpighian tubules are straws that pull nitrogen out of the insect and put it into the intestines, where it will become poop

  • Reproduction: Sexual reproduction

    • The male puts sperm in the female

    • The female then lays eggs that will hatch later

Metamorphosis in insects
Metamorphosis in Insects

  • Metamorphosis means changing from a baby to an adult

  • There are two kinds of metamorphosis:

    • Incomplete metamorphosis (3 stages)

      • Grasshoppers, cicadas, and true bugs

        • Egg

        • Nymph (teenager – looks like a small adult) – only for insects that stay on land (cicadas)

        • OR

        • Naiad – teenager that doesn’t look like the adult and lives in the water (grasshoppers)

        • Adult – the bug


  • Complete metamorphosis (4 stages)

    • Most insects – butterflies, flies, beetles, mosquitoes

    • Eggs

    • Larva – like a little worm (maggots, grubs, wigglers, caterpillars) – childhood bug

    • Pupa – teenager insect – usually inside a case called a cocoon

    • Adult – the bug