Arthropods and their relatives
Download
1 / 35

Arthropods and Their Relatives - PowerPoint PPT Presentation


  • 259 Views
  • Uploaded on

Arthropods and Their Relatives. Characteristics Exoskeleton (external covering made of CHITIN ) Molts or sheds exoskeleton to grow Jointed appendages - Groups very often named in relation to number or type of feet.

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

PowerPoint Slideshow about 'Arthropods and Their Relatives' - gotzon


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
Arthropods and their relatives
Arthropods and Their Relatives

  • Characteristics

    • Exoskeleton (external covering made of CHITIN)

    • Molts or sheds exoskeleton to grow

    • Jointed appendages - Groups very often named in relation to number or type of feet.

    • Tend to undergo metamorphosis or pass through a number of distinct growth stages during their lives

    • Tendency toward High degree of cephalization, especially in Class Insecta


Arthropods
Arthropods

  • Relative abundance.

    • 3/4 of all known species of animals are arthropods.

    • More known species of arthropods than known species of plants and animals combined. Great diversity in form and habitat.


Major groups of arthropods
Major Groups of Arthropods

  • Subphylum Trilobita - all forms extinct (believed) perhaps some of earliest arthropods

  • Subphylum Chelicerata - First pair of appendages form chelicera or pincher-like structures used for feeding. 4 pair of walking legs, no antennae. The Arachnida is the only important parasitic group.


Major groups of arthropods1
Major Groups of Arthropods

  • Subphylum Crustacea - mostly aquatic, most have gills, two pair of antennae. Biramous appendages, meaning limbs have more than one branch. Also have mandibles. Some are parasitic but we will not cover them.

  • Subphylum Uriramia – single branch or uriramous appendages, mandibles, one pair of antennae


Major groups of arthropods2
Major Groups of Arthropods

  • Diplopoda - Millipedes - two pair of legs per body segment

  • Chilopoda - Centipedes - one pair of legs per body segment

  • Insecta - 3 pair of legs on adults, many with wings, most important group


Metamorphosis
Metamorphosis

  • Simple or gradual

    • three changes

      • egg

      • nymph

        • 3-5 instars

      • adult

    • adults and nymphs

      • eat same food


Metamorphosis1
Metamorphosis

  • Complex or complete

    • four changes

      • egg

      • larva

      • pupa

      • adult

    • larvae and adults

      • eat different food

        • larvae are destructive


Fundamental external structure
Fundamental External structure

  • Insects

    • 3 body regions

      • head

      • thorax

      • abdomen

    • 3 pair legs attached to thorax

    • 1 pair antennae

    • wings usually present in adult state.


Hind Wing

Fore Wing

Antennae

Simple Eye

Compound Eye

Jumping Leg

Mouth

Cerci

Palps

Spiracles

Walking Legs

Ovipositor

Abdomen

Thorax

Head


Circulatory system
Circulatory System

  • Closed circulatory system

  • Well developed heart pumps blood

  • Heart is long and narrow

  • Arteries branch into blood vessels and return blood to the heart via veins – cool, just like us!


Excretion
Excretion

  • Recall the Nephridia in Annelids

  • The Malphigian Tubules in Arthropods collect nitrogenous wastes in the tubules from blood

  • Wastes are concentrated (like a kidney does.) Why concentrated?

  • Excreted out anus



Respiratory system
Respiratory System

  • Gills or lungs, as you’ll see on the next slide 

  • Organism is too large to rely on surface area. That is, the internal volume is too great to be supplied with oxygen from a minimal SA.



Sensory adaptations
Sensory Adaptations

  • Well developed nervous system

  • Compound eyes with many lenses give Mosaic Vision or multi-images



The compound eye
The Compound Eye

Each crystalline eye generates an image. All images together generate a mosaic effect


Simple eye ocelli
Simple Eye (Ocelli)

  • Do not form the picture

  • Just gather light

  • Tell whether it’s light or dark




External structure of subphylum chelicerata class arachnae
External structure of Subphylum Chelicerata, Class Arachnae

  • Chelicerates have specialized mouthparts called chelicerae – think of the hooked grabbers!

  • Arachnids (spiders and mites)

    • 2 body regions

      • Cephalothorax

      • abdomen

    • usually 4 pair legs

    • no wings

    • no antennae








ad