The Invertebrates the Worlds Spineless Animal

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The Invertebratesthe WorldsSpinelessAnimal
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Characteristics

• They have no backbone
• Make up about 97 of all animals

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Invertebrate Phyla

• Porifera
• Cnidaria
• Nematoda
• Platyhelminthes

• Mollusca
• Arthropoda
• Annelida
• Echinodermata

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Phylum Porifera

• Most often referred to as sponges
• Simplest group of invertebrates
• They use collar cells, which no other animal has,
  and pores to digest their own food particles

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Phylum Cnidaria

• Jellyfish are in this group
• All cindarians have stinging cells
• They can either be in a medusa form, where they
  look like a mushroom with tentacles, or polyp
  ,where they are usually attached to a surface and
  look like a vase

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Phylum Nematoda

• Hookworms are an example
• They have a simple nervous system
• Some worms, in this pylum, are harmful parasites

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Phylum Platyhelminthes

• This group is made up of flatworms
• Flatworms have sensory lobes on its head, these
  are used to detect food

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Phylum Annelida

• This group includes earthworms
• They are all to some extent segmented

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Phylum Mollusca

• This group includes squids
• This is the second largest group of animals
• Most mollusks live underwater however, some live
  on land
• Every mollusk has a muscular foot, visceral mass,
  which holds the organs, and a mantle, this
  surrounds the visceral mass.

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Phylum Arthropoda

• This group includes spiders
• Most populated type of invertebrate
• Every arthropod has jointed limbs, an
  exoskeleton, a segmented body, and a
  well-developed nervous system

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Phylum Echinodermata

• This group includes sea stars
• All echinoderms are marine animals
• The word echinoderm means spiny skinned
• They also have a simple nervous system