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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

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Intro to invertebrates

Intro to Invertebrates

Chapter 25

Sections 1 & 2

Intro to invertebrates

  • Invertebrates (inverts) include all animals that lack a backbone, or vertebral column.

    • This includes 33 Phyla

Phylum porifera

Phylum 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 Cnidaria

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

  • These organisms are always aquatic.

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

Intro to invertebrates

Phylum nematoda

Phylum 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

Intro to invertebrates


Phylum platyhelminthes

Phylum Platyhelminthes

  • Commonly known as flatworms.

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

  • Most are only 3mm thick.

Intro to invertebrates


Phylum annelida

Phylum Annelida

  • Includes organisms such as earthworms and leeches

  • The word Annelida means little ring in Latin

Phylum mollusca

Phylum Mollusca

  • 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

Intro to invertebrates




  • 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

  • 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

Intro to invertebrates

  • Bilateral symmetry- a single imaginary plane divides the body into left and right sides that are mirror images of each other.

    • Lobster, earthworms, snails

Intro to invertebrates

  • Germ Layers-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.

Intro to invertebrates

  • Mesoderm- middle layer that gives rise to muscles and much of the circulatory, reproductive, and excretory systems.

  • Ectoderm- outermost layer that produces sense organs, nerves, and the outer layer of the skin

Intro to invertebrates

  • Body Cavities- 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.

Intro to invertebrates

  • Segmentation- repeated parts on an animal. Most have repeated body parts on the inside also.

Intro to invertebrates

  • Cephalization-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

What type of symmetry

What type of symmetry?

What type of symmetry1

What type of symmetry?

What type of symmetry2

What type of symmetry?

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