Intro to invertebrates
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Intro to Invertebrates . Chapter 25 Sections 1 & 2. Invertebrates (inverts) include all animals that lack a backbone, or vertebral column. This includes 33 Phyla. Phylum Porifera. The term Porifera means “pore-bearers” in Latin. This phylum includes Sponges.

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Intro to invertebrates

Intro to Invertebrates

Chapter 25

Sections 1 & 2



Phylum porifera
Phylum backbone, or vertebral column.Porifera

  • The term Poriferameans “pore-bearers” in Latin.

  • This phylum includes Sponges.

  • Most ancient member of the Kingdom Animalia.

  • One of the most simple organisms


Phylum cnidaria
Phylum backbone, or vertebral column.Cnidaria

  • Organisms include jellyfish, anemones, hydra, and coral.

  • These organisms are always aquatic.

  • Can live in giant colonies such as the Great Barrier Reef


http:// backbone, or vertebral column.www.youtube.com/watch?v=by1S-kZ4gN4


Phylum nematoda
Phylum backbone, or vertebral column.Nematoda

  • Range in size from microscopic to 1 meter

  • Can live on land and in water.

  • Some are parasitic

  • Closely related to the phylum Arthropoda


  • http:// backbone, or vertebral column.www.youtube.com/watch?v=SpgjnXEFadg


Phylum platyhelminthes
Phylum Platyhelminthes backbone, or vertebral column.

  • Commonly known as flatworms.

  • They are the most simple animals to have 3 germ layers.

  • Most are only 3mm thick.


  • http:// backbone, or vertebral column.www.youtube.com/watch?v=mh2dTIRReXU


Phylum annelida
Phylum Annelida backbone, or vertebral column.

  • Includes organisms such as earthworms and leeches

  • The word Annelida means little ring in Latin


Phylum mollusca
Phylum Mollusca backbone, or vertebral column.

  • Includes both marine and terrestrial organisms

  • Ex. Snails, clams, squid, and octopi

  • Have a larval stage in development

  • Typically have an internal or external shell


  • http:// backbone, or vertebral column.www.youtube.com/watch?v=WqMNjUp6UeA


Echinodermata
Echinodermata backbone, or vertebral column.

  • Echino- means spiny in Greek and Detmis- means skin (spiny skin)

  • Includes sea urchins, sand dollars, and Sea Stars

  • Only live in the sea

  • Have a structure called “tube feet”


Body plans of inverts
Body Plans of Inverts backbone, or vertebral column.

  • Body Symmetry

    • Radial Symmetry- a number of imaginary planes drawn through the center of the body will divide the organism in equal halves.

      • Ex: Sea Stars, Sea Anemone, and Jelly Fish



  • Germ Layers body into left and right sides that are mirror images of each other.-during embryonic development the cells of most animals differentiate into 3 layers, called germ layers

    • Endoderm- is the inner most layer and develops the lining of the digestive tract and much of the respiratory system.



  • Body Cavities- of the circulatory, reproductive, and excretory systems.a fluid-filled space between the digestive tract and the body wall

    • The most complex organisms have a true coelom, which is a body cavity that develops within the mesoderm and is completely lined.

    • Pseudocoelom is a partially lined body cavity

    • Acoelomthere is no body cavity present.



  • Cephalization- repeated body parts on the inside also.The concentration of sense organs and nerve cells at the organisms anterior end. (to have a head)

    • The most successful animal groups exhibit cephalization.


Review game
Review Game repeated body parts on the inside also.


What type of symmetry
What type of symmetry? repeated body parts on the inside also.


What type of symmetry1
What type of symmetry? repeated body parts on the inside also.


What type of symmetry2
What type of symmetry? repeated body parts on the inside also.


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