Download - Phylum Arthropoda
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The Arthropods
*Phylum Arthropoda
Keith
Pow
er
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*Arthropods are by far the most successful of all animals*Well over 1,000,000 species*Some say over 30 million species of insects alone!*There are around 200 million individual insects alive at any
given time for each human!*Arthropods exhibit these key features:*Exoskeleton: made of chitin, and must be molted (shed) in order
to grow *Segmentation: the body is divided into sections* Jointed appendages: (arthropod means ‘jointed feet’) they may be
modified into antennae, mouthparts or legs!
UC Berkeley
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*Key features of Arthropods cont. *Circulatory System: they
have an open circulatory system (no veins or arteries) but a heart is present*Nervous system: they have
a brain but also ganglia are in each segment. This results in the arthropod being able to carry out functions like eating, moving and reproducing without a brain present!*They also have compound
eyes: hundreds or more of independent eyes www.teachersparadise.com
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*Key features of Arthropods cont. *Respiratory System: Marine arthropods have gills*Spiders have book lungs (leaf-like plates within a chamber)*Terrestrial arthropods have tracheae (small branched ducts that
eventually network to each cell) with the opening to the air called spiracles
*Excretory System: aquatic arthropods diffuse most waste through gills, terrestrial insects have Malpighian tubules (slender projections from the digestive tract into the blood, wastes diffuses into them)
2004, Pearson Education
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*Spiracles and trachea: Malpighian tubules:
McGraw-Hill
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*Digestion/feeding: varied and complex, range from predators to herbivores, complete digestive system present*Reproduction: sexual, lay eggs, may include
metamorphosis*Movement: jointed appendages! Fly, walk, or swim
Peter Pitman
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*Class Chelicerata: spiders, mites, ticks, horseshoe crabs
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*Class Crustacea: crabs, shrimps, lobsters, and pill bugs
The Kids Window
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*Class Crustacea: crabs, shrimps, lobsters, and pill bugs
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*Class Crustacea: crabs, shrimps, lobsters, and pill bugs
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Class Crustacea: crabs, shrimps, lobsters, and pill bugs
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*Class Crustacea: Even barnacles!
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*Crustacea anatomy: the crayfish*Chelipeds: for defense and prey capture*Swimmerets: for locomotion and
reproduction (holds eggs)
kentsimmons.uwinnipeg.ca
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*Class Hexapoda: The insects!
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*Class Hexapoda: The insects!
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*Insect Anatomy:*Body divided into three segments: head,
thorax and abdomen*Mandible for crushing food
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*Class Myriapoda: Centipedes and Millipedes