ABBOTTSCOLLEGE Page 79 1. 2 From the Greek ἄ ρθρον (árthron - "joint“) & ποδός...
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Transcript of ABBOTTSCOLLEGE Page 79 1. 2 From the Greek ἄ ρθρον (árthron - "joint“) & ποδός...
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ABBOTTSCOLLEGE
Page 79
PHYLUM ARTHROPODA
ANIMAL KINGDOM
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• From the Greek ἄρθρον (árthron - "joint“) & ποδός (podós - "leg“)
• Includes insects, arachnids, and crustaceans• Most abundant and diverse phylum: make up
80% of all living animals• Occupy the widest variety of habitats• They affect humans both adversely and
positively• They are the most successful group of land
animals
PAGE 79
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BODY PLAN OF ARTHROPODS3
Bilaterally symmetrical Have a coelom
is reduced and replaced by a haemocoel = blood filled space
Triploblastic tissue layers Cephalisation A through gut Segmentation
Nervous system similar to Annelids, but sensory organs are more advanced
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HAEMOCOEL7
A blood filled space Forms an open blood system with a heart to
pump the fluid around Less efficient than a closed blood system
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CLASSIFICATION OF ARTHROPODA8
Are classified into five subphyla:
1. Trilobites
2. Chelicerata
3. Myriapoda
4. Crustacea
5. Hexapoda
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TRILOBITES10
Group of marine animals Died in the the Permian-Triassic extinction
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CHELICERATA11
Includes spiders, mites and scorpions Have chelicerae (pincer like mouthparts) Four pairs of legs Cephalothorax
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MYRIAPODA13
Includes millipedes and centipedes
Have many body segments, each bearing one or two pairs of legs
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CRUSTACEA
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An aquatic group Include lobsters, crabs, barnacles and crayfish Have branched appendages And chewing mandibles (mouthparts)
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HEXAPODA15
Made up of insects
Have: Six thoracic legs Body divided into head,
thorax and abdomen A single pair of antennae And compound eyes
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SUCCESS
Have an adaptable body plan: • Waterproof skeleton made of chitinous cuticle• A degree of segmentation• Paired, jointed appendages• Complex muscle system• Development involves metamorphosis
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Metamorphosis is a biological process by which an animal physically develops after birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation.
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Chitinous Cuticle
• Made of lipd, protein, chitin molecules & may be impregnated with calcium carbonate
• Hardened to various degrees• Prevents water loss so that they can live on land• Cuticles must be shed regularly to allow animals to
grow – called moulting
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TO DO
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PAGE 81
LEARNING ACTIVITY 2
BODY PLANS OF ARTHROPODS
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THE END
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