Phylum Arthropoda


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Cecelia Lounsberry and Gabe Dwyer

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Phylum Arthropoda

  1. 1. Phylum ArthropodaBy: Cecelia Lounsberry and Gabe Dwyer
  2. 2. General Characteristics● Bilaterally Symmetrical● Cells form up to the size of tissues and organs.● Eat everything from plants to animals● Live everywhere in land, fresh water, salt water, and every other environment● Largest Phyla on earth 
  3. 3. Support System● Exoskeleton-made of protein and chitin -used for protection -keeps joints attached -molting- sheds exoskeleton as it grows.● usually contain a range from 3 to 300 sets of legs; usually have 2 pairs of antennae● segmentation-head, thorax, abdomen
  4. 4. Digestive/Excrete System● Eat Everything● Food enters through the mouth and flows into the mid-gut where food is broken down and pushed to the hind gut.● Nutrients and wastes are separated and either dispersed through the body or excreted in the form of guanine (DONT drink energy drinks!)
  5. 5. Circulatory System● Open Circulatory System body fluid enters pores to the organs and is propelled through arteries to the body● Body fluid-Hemolymph (NOT blood)● Hemolymph is pumped by the heart to sinuses called the hemocoel● No Veins
  6. 6. Respiratory System● Aquatic arthropods possess gills for respiration● Land arthropods have a tracheae and book lungs as respiratory organs● Air passes through the tracheae through specialized openings in the exoskeleton called spiracles
  7. 7. Nervous System● Double chain of ganglia along the ventral surface of the arthropod● At anterior end are 3 fused pairs of dorsal ganglia, constitutes the brain● Much of the control of arthropods activities is in the central ganglia
  8. 8. Reproductive System● Most reproduce sexually ○ However, some species reproduce through parthenogenesis● Sperm are usually transferred to the female in sealed packets called spermatophores● The paired sex organs are connected directly to the ducts that open unto the ventral surface of the trunk 
  9. 9. Hexapoda● Includes insects● Mostly live on land● 3 pairs of legs; 2 pairs of wings● There are more species of Hexapoda than all other forms of life combined  
  10. 10. Cheliceriforms● Includes horseshoe crabs, spiders, scorpions, ticks and mites● Live on land or in water● Have chelicerae, which serve as pincers or fangs.● They do not have antennae
  11. 11. Crustaceans● Live in fresh and salt water environments● Crustacea is Latin for "Shell"● Shell is made of calcium, protein, and chitin● Have anywhere from 16 to 60 segments; 2-3 pairs of legs● Advanced crustaceans have pincers● Include: Crabs, Lobsters, Barnacle, Shrimp 
  12. 12. Myriapods● All Myriapods live on land● Head contains 3 appendages for eating including mandibles (jaw like structure)● Millipedes -less than 1000 legs (2 pairs per segment) -herbivores -among earliest animals on land● Centipedes -1 pair of legs per segment -carnivorous (havepoison claws)