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Invertebrates Over 90% of animals are invertebrates !

Invertebrates Over 90% of animals are invertebrates ! . Characteristics of invertebrates. They are multicellular . They are eukaryotes . They are heterotrophs . They don’t have a cell wall . They can move . Most are organised in a way called symmetrical . Sponges and

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Invertebrates Over 90% of animals are invertebrates !

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  1. InvertebratesOver 90% of animals are invertebrates!

  2. Characteristics of invertebrates • They are multicellular. • They are eukaryotes. • They are heterotrophs. • Theydon’thave a cellwall. • They can move. • Most are organised in a way • calledsymmetrical. Sponges and • coral are notsymmetrical. • Mosthavenervous and muscletissue. Evensponges can movewhenthey are larvae.

  3. Symmetry This means one can draw a line down the middle of the animal and the two sides will be similar like mirror images. bilateralsymmetryradialsymmetry

  4. Invertebrate Phyla Porifera Annelida Cnidaria Mollusca Echinodermata Arthropod

  5. Common names for the phyla

  6. Phylum Poriferasponges Found in marine environment. The most primitive of the invertebrates. They are mobile only in the larvae stage. They are filterfeeders. The spongeswe use in The bathtub can be naturally harversted or artificially made.

  7. Phylum Cnidariastingingcellanimals Found in marine environment Havespecialisedstingingcellswhichthey use to stuntheirprey. Use tentacles to sweep in prey.

  8. Phylum Annelida Live on landaswellas under water Havemuscles Have a long, slender body Segmented body – many body parts duplicated in eachsegment

  9. Phylum Echinodermata Found in marine environment Needlelikespinesused for protection Radialsymmetry

  10. Phylum Mollusca Soft bodied Mosthave a protectiveshell Manyhave a muscularfoot for movement

  11. Phylum Arthropoda Includesincredibly diverse groupssuchas: insects, crustaceans, spiders, scorpions, and centipedes. bilateral symmetry, segmented bodies each body segment bears a pair of jointed appendages movement controlled by complex muscular system body covered by an exoskeleton

  12. spiders and insects are both part of the phylum Arthropoda What’s the differencebetween a spider and an insect?

  13. What’s the differencebetween a spider and an insect? Spiders • body divided in 2 segments: cephalothorax , abdomen; • 4 pairs of appendages; • 4 eyes; • no antennea Insects: • body divided in 3 segments: head, thorax, abdomen; • 3 pairs of appendages; • haveantennea; • some havewings

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