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Arthropod Groups. David J. Shetlar, Ph.D. The “BugDoc”. The Ohio State University, OARDC & OSU Extension Columbus, OH. © October, 2004, D.J. Shetlar, all rights reserved. What is Entomology?. The study of insects (and their near relatives). What are insects

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slide1

Arthropod Groups

David J. Shetlar, Ph.D.

The “BugDoc”

The Ohio State University,

OARDC & OSU Extension

Columbus, OH

© October, 2004, D.J. Shetlar, all rights reserved

slide2

What is Entomology?

The study of insects

(and their near relatives).

What are insects

(and near relatives)?

Insects and their relatives are

ARTHROPODS.

slide3

Review of Zoological Nomenclature

(classifying & naming)

Taxonomic Categories

Phylum

Class

Order

Family

Genus

Genus & species

slide4

Review of Zoological Nomenclature

Taxonomic Categories

Kingdom - Animalae

Phylum - Arthropoda

Class - Hexapoda (=Insecta)

Order - Coleoptera

Family - Scarabaeidae

Genus - Popillia

Genus & species -

Popillia japonicaNewman

slide5

Characteristics of the Phylum

Arthropoda

  • The segmented bodies are arranged into regions, called tagmata (e.g., head, thorax, abdomen).
  • The paired appendages (e.g., legs, antennae) are jointed.
  • They posses a chitinous exoskeletion that must be shed during growth.
  • They have bilateral symmetry.
  • The nervous system is ventral (belly) and the circulatory system is open and dorsal (back).
slide6

What are some other Animal Phyla?

  • Protozoa - single-celled animals.
  • Platyhelminthes - flatworms, tapeworms
  • Nematoda - roundworms
  • Mollusca - clams, snails & slugs, squids
  • Echinodermata - starfish, sea urchins
  • Annelida - segmented worms (earthworms)
  • Chordata - fish, amphibians, reptiles, birds, mammals
slide7

Arthropod Groups (taxa)

The arthropods are divided into two large groups that exist today:

The Chelicerates

and

The Mandibulates

slide8

Chelicerate Arthropod Characters:

  • Pincher-like mouthparts - chelicerae - and pedipalps
  • NO antennae
  • Two body regions, usually - cephalothorax & abdomen
  • Four pairs of legs
  • Horseshoe crabs and arachnids are only living groups
slide9

Mandibulate Arthropod Characters:

  • Mouthparts are mandibles - normally chewing sideways
  • One or two pairs of antennae
  • Various body region arrangements - cephalothorax & abdomen / head & trunk / head, thorax & abdomen
  • Variable leg numbers
  • Insects, crustaceans & myriapods
slide10

Orders of Arachnids

  • Scorpiones - scorpions
  • Pseudoscorpiones - false scorpions
  • Opiliones - daddy-long-legs or harvestmen
  • Acari - mites & ticks
  • Araneae - spiders
slide11

Pseudoscorpion

Tick

(a mite)

Scorpion

Wolf

Spider

Daddy-long-legs

slide14

chelicerae

eyes

pedipalp

slide16

pedipalps &

chelicerae

cephalothorax

abdomen

Mite and Tick Body Regions

slide17

American dog tick male

Blacklegged (deer) tick female

slide19

Clover mites

Twospotted spider mites

Predatory mite

slide21

pedipalp

chelicera (fang)

cephalothorax

narrow waist

abdomen

Spider Anatomy

slide22

Abdomen

Cephalothorax

Chelicera (fang)

Pedipalp

Jumping Spider

slide23

Wolf spider with egg case

Spitting spider

Orbweaving spider

Tarantula

slide24

Black widow with egg case

Brown recluse

(fiddleback)

slide25

Classes of Myriapods

(many legged arthropods)

(all have one pair of antennae, a head region, and trunk with many pairs of legs, use trachea)

  • Diplopoda - millipedes
  • Chilopoda - centipedes
  • Symphyla - garden centipedes
slide26

Millipede (Diplopoda)

Two pair of legs per visible segment, attached under body.

Centipede (Chilopoda)

Pair of fangs under head, one pair legs per visible segment - attached to side of body.

Symphylan (Symphyla)

[garden centipede]

No fangs, no eyes, legs attached to side of body.

Myriapods

[one pair of antennae, head & trunk regions, trunk with many pairs of legs]

slide27

Millipede (Diplopoda)

Centipede (Chilopoda)

Garden centipede (Symphyla)

slide28

Classes of Crustacea

(mostly marine, fresh water, a few terrestrial)

(all have two pair of antennae, five or more pairs of legs, segmented abdominal appendages, head & trunk or cephalothorax & abdomen body arrangement, have gills)

  • Isopoda - sowbugs or pillbugs
  • Amphipoda - sand fleas, amphipods
  • Cirripedia - barnicles
  • Decapoda - crabs, lobster, shrimp
  • several other minor orders
slide29

Crayfish cephalothorax

(Decapoda)

Sowbug (Isopoda),

a terrestrial crustacean