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ARTHRPPODS. Chapter 24. What is Entomology?. The study of insects (and their near relatives). Review of Zoological Nomenclature. Taxonomic Categories. Kingdom - Animalae Phylum - Arthropoda Class - Insecta Order - Coleoptera Family - Scarabaeidae Genus - Popillia Genus & species

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ARTHRPPODS

Chapter 24

What is Entomology?

The study of insects

(and their near relatives).


Review of Zoological Nomenclature

Taxonomic Categories

Kingdom -Animalae

Phylum - Arthropoda

Class -Insecta

Order -Coleoptera

Family -Scarabaeidae

Genus -Popillia

Genus & species

Popillia japonica Newman


Characteristics of the Phylum

Arthropoda

24.1

  • Segmented bodies (e.g., head, thorax, abdomen).

  • Paired appendages (e.g., legs, antennae) are jointed.

  • Chitinousexoskeletion that must be shed.

  • Bilateral symmetry.

  • The nervous system is dorsal (belly) and the circulatory system is open and ventral (back).


Arthropod Exoskeletons

  • Joints are made of stiff and flexible cuticle to allow movement.

  • The exoskeleton is made of many layers of chitin.

    • hard material that protects the body

    • must be shed in order to grow


  • Crustaceans—live in oceans,

    freshwater streams, and on land

Arthropod Classification

  • Chelicerates—specialized dagger-like

    mouthparts

  • Insects—most live on land, have six legs

  • Myriapods—long bodies and many pairs of legs


Crustaceans(Marine Arthropods)

24.2

  • two distinct body sections, cephalothorax and abdomen

  • one pair of appendages per segment

  • two pairs of antennae

  • exoskeleton

  • carapace


Crustacean Appendages

  • Crustacean appendages are used for a variety of functions.

    • collecting and manipulating food

    • attracting females

    • Protection

    • claws, antennae, walking legs, swimmerets, and mandibles.


Types of Crustaceans.

  • Decapods such as lobsters and crabs have ten legs.

  • Isopods such as pill bugs

  • have flattened bodies

  • and seven pairs of legs.

  • Barnacles are sessile filter

  • feeders wrapped in a hard shell.


fangs

poison gland

spinnerets

Chelicerate Arthropod Characters:

  • Pincher-like mouthparts - chelicerae

  • NO antennae

  • Two body regions, usually - cephalothorax & abdomen

  • Four pairs of legs

  • Horseshoe crabs and arachnids are only living groups

24.3


Arachnids are the largest group of chelicerates.

  • There are three major groups of chelicerates.

    • horseshoe crabs

    • sea spiders

    • arachnids


Arachnids -- Spiders

  • All spiders make silk and produce venom.


Metamorphosis

CHANGE IN FORM FROM EGG TO ADULT


Incomplete

INCOMPLETEMETAMORPHOUS

Insects change shape gradually!


CompleteMetamorphosis

Four stages that all look different


Insects with Complete Metamorphosis

  • beetles

  • bees, ants, wasps

  • Flies

  • butterflies

EGG  LARVA  PUPA  ADULT


Insects with Incomplete Metamorphosis

EGG  NYMPH  ADULT

  • fleas

  • grasshoppers & crickets

Wings NOT fully developed


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