Animal Kingdom

Invertebrates

Tour of the Invertebrate Organisms of the Animal Kingdom

Invertebrates Are Animals

• Animal Characteristics– Eukaryotic

– Heterotrophic

– Multicellular, specialized cells

– Lack Cell Walls

– Reproduce, sexual and asexual

– Respond to environment

– Motile, muscles

Specifics to Invertebrates

• Characterized by No Backbone!Other means of structure

• Exoskeleton, Spicules, Shells, Pin, Hydrostatics

• Invertebrate Fun Facts

• 95% of all animal species

• Sizes range from microscopic to 20 meters

Classifying Invertebrates

• Body Symmetry

• Cephalization Level

• Body Plan• Layers of Tissue

• Early Development – Protostome or Deuterostome

Major Groups• Crustacea

• Platyhelminthes• Annelida• Porifera• Cnidaria• Insecta

• Mollusca• Nematoda

• Echinodermatahttp://school.discovery.com/clipart/ , http://clipart.usscouts.org

Things to Consider

• Level of Classification– Phylum or Class

• Common name examples for each– sea star

• Type of Symmetry– bilateral

• Type of Body Plan– acoelomate, coelomate

• Development of systems– Circulatory

• Movement

Invert TourTitle-Invert Tour- Animals without a backbone. They share the LACK of a trait.Purpose- Observe and gather information to compare/contrast Invert groups.Observations and Notes-

Class or Phylum

name

Examples- Common

names

Type of symmetry

Type of Body plan

systems Major characteristics Rank

Conclusion-Reference chapters 26-29 Dragonfly

1. Which invert groups do you believe are the LEAST complex? WHY?

2. Which invert groups do you believe are the MOST complex?WHY?

3. List your evolutionary ranking from LEAST to MOST complex.1.2.3.4.5.6.7.8.9.

4. How does YOUR RANKING compare to the BOOK model? (pgs 747-749) Explain in detail your ranking differences and

similarities.

Class or Phylum name

Examples- Common

names

Type of symmetry

Type of Body plan

systems Rank

Class

Crustacea

Shrimp, crabs, lobsters,

barnacles

bilateral coelomate Open circ.- heart, brain

Struct for resp- gills or book gills,

5

Phylum Platyhelminthes

Flukes tapeworms

bilateral acoelomate Diffusion- resp, excre, circ, single opening for digestion, cephalization

3

Phylum

Annelida

Earthworms leeches

bilateral coelomate Closed circ system, nephridia-waste, brain, primitive heart

5

Phylum

Porifera

Tube Sponge

Dead Man’s Fingers

asymmetry acoelomate Sessile, no tissues or organ systems

H2O movement allows – circ. resp, excretion, feeding

1

Phylum

Cnidaria

Jellyfish corals, hydra

radial acoelomate Stinging cells in tentacles, gastrovascular cavity, diff. for resp, circ, excre -nerve net

2

Class

Insecta

Bees, butterflies,

beetles, ants

bilateral coelomate Open circ- heart, struct for resp- tracheal tubes, brain

5

Phylum

Mollusca

Snails, octopi, squid, clams

bilateral coelomate Soft-body- internal or external shell, aquatic-gills, snails/clams- open circ.

Squid/oct closed circ, small ganglia to brains

5

Phylum

Nematoda

C. Elegans Ascaris

bilateral pseudocoelmate

Digestive sys- two openings

Diffusion- resp, excre, circ

4

Phylum Echinodermata

Sea stars, sea urchins, sand

dollars

radial coelomate Endoskeleton, water-vas, sys- resp, circ, movement tube feet nerve ring/ nerves

6