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INVERTEBRATES CH. 24-27. Kingdom Animalia Major Characteristics= eukaryotic, multi-cellular, heterotrophic, lack a cell wall Invertebrates Include 95-97%

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Presentation on theme: "INVERTEBRATES CH. 24-27. Kingdom Animalia Major Characteristics= eukaryotic, multi-cellular, heterotrophic, lack a cell wall Invertebrates Include 95-97%"— Presentation transcript:

1 INVERTEBRATES CH. 24-27

2 Kingdom Animalia Major Characteristics= eukaryotic, multi-cellular, heterotrophic, lack a cell wall Invertebrates Include 95-97% of all animal species Without a backbone

3 Exoskeleton Hard, tough outer covering that provides framework and support Made of chitin

4 Endoskeleton Internal skeleton

5 Endoderm Inner layer of cells in the gastula Develops into tissues and organs of the digestive tract

6 Ectoderm Outer layer of cells in the gastula Develops into skin and other body coverings and the nervous system

7 Mesoderm Between the endoderm and ectoderm Develops into skeletons and muscles

8 Coelom Fluid filled cavity Provides open space inside of body

9 Coelom

10 Segmentation put together Sections multiple body components

11 Cephalization Animals with anterior (head) & posterior (tail) Tendency to concentrate nervous and sensory organs at the anterior Development of a specialized head

12 Asymmetry Irregular shape Ex. Sponge

13 Radial symmetry Body plan in which parts repeat around an imaginary line drawn through the center Ex. Cnidarians (jellyfish)

14 Bilateral Symmetry Body plan in which left and right sides are identical when an imaginary line is drawn through the center Ex. Flatworm

15 Sponges Sessile: live entire adult life attached to a single spot Very simple: no mouth, no organ systems Rely on the movement of water through their bodies for respiration, circulation, and excretion Based on their shape, what is their symmetry?

16 Cnidarians Soft-bodied, carnivorous, stinging tentacles Simplest animals to have body symmetry and specialized tissues Based on their shape, what is their symmetry?

17 Platyhelminthes (Flatworms) Soft, flattened worms Simplest organisms to have cephalization Based on their shape, what is their symmetry?

18 Nematoda (Roundworms) Unsegmented worms Have pseudocoeloms and digestive systems with two openings Many are predators Some act as parasites that affect humans Based on their shape, what is their symmetry?

19 Mollusca Soft-bodied Usually have an internal or external shell Based on their shape, what is their symmetry?

20 Annelida (Segmented Worms) Worms with segmented bodies Have a true Based on their shape, what is their symmetry?

21 Arthropoda Have a segmented body, tough exoskeleton, jointed appendages Exoskeleton Hard, tough outer covering that provides framework and support Made of chitin

22 Arthropoda - Crustaceans Two pairs of antennae, and two or three body sections Have chewing mouthparts called mandibles Based on their shape, what is their symmetry?

23 Arthropoda – Arachnids (Chelicerates) Have mouthparts called chelicerae Two body sections Nearly all have four pairs of walking legs Based on their shape, what is their symmetry?

24 Arthropoda - Insects Jaws One pair of antennae Three-part bodies head, thorax, abdomen legs attached to thorax Based on their shape, what is their symmetry?

25 Echinodermata Sea Cucumber Sea Urchin Spiny skin Internal skeleton Water vascular system Suction-cup feet Based on their shape, what is their symmetry?

26 Circulatory Systems Open circulatory system- a system in which blood vessels from the heart are not contained in blood vessels

27 Circulatory Systems Closed circulatory system- a system in which blood is confined to vessels as it moves through the body


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