Invertebrates Over 90% of animals are invertebrates!
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Transcript of Invertebrates Over 90% of animals are invertebrates!
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InvertebratesOver 90% of animals are invertebrates!
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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 coral are not symmetrical.• Most have nervous and muscle tissue.
Even sponges can move when they are larvae.
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Symmetry
This means one can draw a line down the middle of the animal and the two sides will be similar like mirror images.
bilateral symmetry radial symmetry
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Invertebrate Phyla
PoriferaAnnelidaCnidariaMolluscaEchinodermataArthropod
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Common names for the phyla
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Phylum Poriferasponges
The sponges we use in The bathtub can be naturally harversted or artificially made.
Found in marine environment.
The most primitive of the invertebrates.
They are mobile only in the larvae stage.
They are filter feeders.
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Phylum Cnidariastinging cell animals
Found in marine environment
Have specialised stinging cells which they use to stun their prey.
Use tentacles to sweep in prey.
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Phylum Annelida
Live on land as well as under water
Have muscles
Have a long, slender body
Segmented body – many body parts duplicated in each segment
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Phylum Echinodermata
Found in marine environment
Needle like spines used for protection
Radial symmetry
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Phylum Mollusca
Soft bodied
Most have a protective shell
Many have a muscular foot for movement
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Phylum Arthropoda
Includes incredibly diverse groups such as: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
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spiders and insects are both part of the phylum Arthropoda
What’s the difference between a spider and an insect?
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What’s the difference between 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;• have antennea;• some have wings