Phylum Arthropoda

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Phylum Arthropoda
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Phylum Arthropoda
Several million species. Hard exoskeleton.
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Phylum Arthropoda  Arthropods (crustaceans,
spiders, insects)             Hard exoskeleton,
segmented bodies, jointed appendages            
Arthropods are the most successful of all animal
phyla based on diversity, distribution, and
numbers.   Nearly one million species identified
so far, mostly insects.   The exoskeleton, or
cuticle, is composed of protein and
chitin.    Open circulatory systems in which a
heart pumps hemolymph through short arteries and
into open spaces (sinuses). Aquatic members-
gills for gas exchange terrestrial members-
tracheal system of branched tubes leading from
surface throughout body.
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• Classes of Arthropods
• Class Arachnida
• 1. examples spiders, scorpions, ticks, mites
• 2. main body parts two cephalothorax and
  abdomen
• 3. number of legs -four pair ( eight )
• 4. mostly terrestrial

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B. Class Insecta the insects 1. examples
flies, ants, wasps, bees, beetles, dragonflies,
butterflies, cicadas mayflies, grasshoppers,
crickets. 2. main body parts 3 head,
thorax and abdomen 3. number of legs 3 pair
(six) 4. mostly terrestrial
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• Class Chilopoda
• 1. examples centipedes
• 2. main body parts many segments
• 3. number of legs one pair (two)
• per segment
• 4. terrestrial
• 5. carnivorous
• 6. head has large antennae
• 7. first body segment modified
• as poison claws

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D. Class Diplopoda 1. examples millipedes 2.
many body parts - many segments 3. number of
legs two pair ( four ) per segment 4.
terrestrial, herbivorous
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D. Class Crustacea 1. examples crabs,
lobsters, cray- fish, shrimp, barnacles 2. body
parts two to three 3. number of legs five
pair ( ten ) usually 4. mostly marine
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Class Crustacea E.g., crabs, lobsters          Al
most all are aquatic. Ca. 40,000
species.             Includes krill eaten by
whales, and daphnia, copepods, amphipods in
Lake Erie, pill bugs, etc.
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