Transcript

ARTHROPODSARTHROPODS

Ch. 24Ch. 24

General Characteristics General Characteristics

Segmented bodiesSegmented bodies Jointed appendagesJointed appendages Hard external skeleton (exoskeleton Hard external skeleton (exoskeleton

made of chitin)made of chitin)

General CharacteristicsGeneral Characteristics

MoltingMolting Open circulatory systemOpen circulatory system Brain with gangliaBrain with ganglia Compound eyesCompound eyes

General CharacteristicsGeneral Characteristics

Some aquatic arthropods have gillsSome aquatic arthropods have gills Terrestrial arthropods have Terrestrial arthropods have trachaetrachae

(exchange CO(exchange CO22 and O and O22 change through change through

holes called holes called spiraclesspiracles).).

Examples of ArthropodsExamples of Arthropods

560 million years old560 million years old CrustaceansCrustaceans- live in the ocean- live in the ocean

Crayfish, crabs, lobsters, barnaclesCrayfish, crabs, lobsters, barnacles ArachnidsArachnids

Spiders, ticks, scorpians, mitesSpiders, ticks, scorpians, mites InsectsInsects Myriapods- many legsMyriapods- many legs

Centipedes, millipedesCentipedes, millipedes

Extinct ArthropodsExtinct Arthropods

TrilobitesTrilobites

EurypteridsEurypterids

**Horseshoe crabs are the only closest living relatives.

ReviewReview

1) List 3 characteristics of arthropods that 1) List 3 characteristics of arthropods that unite them as a single large group.unite them as a single large group.

2) Name 1 group of arthropod that is now 2) Name 1 group of arthropod that is now extinct. Name at least 3 groups still in extinct. Name at least 3 groups still in existence today. existence today.

INSECTSINSECTS

Keys to Insect SuccessKeys to Insect Success

Ability to fly (1 or 2 pairs of wings)Ability to fly (1 or 2 pairs of wings) Diverse feeding habitsDiverse feeding habits

Many types of mouthpartsMany types of mouthparts

Digestive enzymes to eat unusual foodDigestive enzymes to eat unusual food

Keys to Insect SuccessKeys to Insect Success

Video clipVideo clip Metamorphosis- body form changes from Metamorphosis- body form changes from

juvenile to adultjuvenile to adult Larva, pupa, adultLarva, pupa, adult

Impact of InsectsImpact of Insects

Bees & flowersBees & flowers Termites & woodTermites & wood Insect Medicine?Insect Medicine? Diseases/ pestsDiseases/ pests EntomologyEntomology- study and classification of - study and classification of

insectsinsects

Insect CollectionInsect Collection

Some Major Orders of InsectsSome Major Orders of Insects

Lubber Grasshopper Lubber Grasshopper DissectionDissection

Grasshopper HeadGrasshopper Head

Compound eyesCompound eyes Simple eyesSimple eyes MandibleMandible PalpsPalps Antennae Antennae

Grasshopper ThoraxGrasshopper Thorax

Tympannic Tympannic membranemembrane

Jumping legsJumping legs Walking legsWalking legs 2 pairs of wings2 pairs of wings

Grasshopper AbdomenGrasshopper Abdomen

SpiraclesSpiracles Ovipositor (if female)Ovipositor (if female)

Grasshopper Internal Grasshopper Internal AnatomyAnatomy

Grasshopper Internal Grasshopper Internal AnatomyAnatomy


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