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Phylum Arthro poda “joint” “foot”

Phylum Arthro poda “joint” “foot”. 80% of all animals are arthropods….. 76% of those are insects…. www.onacd.ca. Arthropod means “jointed legs” Contains more species than all other species of animals added together

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Phylum Arthro poda “joint” “foot”

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  1. Phylum Arthropoda“joint” “foot” 80% of all animals are arthropods….. 76% of those are insects….. www.onacd.ca

  2. Arthropod means “jointed legs” • Contains more species than all other species of animals added together • Extreme diversity in habitat (marine, freshwater, terrestrial and air), adaptations and food sources

  3. Some amazing arthropods

  4. Major Classes of Arthropods Above: Subphylum Myriapoda, Class Diplopoda: includes the millipedes Above left: Subphylum Myriapoda, Class Chilipoda: includes the centipedes Lower Right: Subphylum Hexapoda, Class Insecta: includes all 6 legged insects

  5. Above: Subphylum Crustacea, Class Maxillopoda: includes the barnacles Above Left: Subphylum Chelicerata Class Arachnida: includes the spiders, mites and scorpions Lower right: Subphylum Crustacea, Class Malacostraca: includes the lobsters, crab and shrimp

  6. Characteristics of Arthropods • Symmetry: Bilateral • Level of Organization: Organ • Exoskeleton of chitin secreted by the epidermis • 3 body regions (head, thorax and abdomen) • Open circulatory system • Separate sexes (Dioecious): fertilization is usually internal

  7. Male vs. Female crabs Male or Female? Male or Female?

  8. Sensory organs are well-developed: • compound eyes • tympanum (drum-like ear) • antenna (touch, smell, chemical reception) • Complete digestive systems with mouth, specialized organs and anus • Respiration by body surface, gills, trachea, or book lungs • Developed nervous system with a brain and double ventral nerve cords

  9. A closer look at Classes of Arthropods Class Insecta • Head with 6 segments, sensory antennae and compound eyes • Thorax with attached segmented legs and possibly wings • Abdomen with 11 segments which has most of the digestive, respiratory, excretory and reproductive systems

  10. Insects breathe through small tubes and sacs that are directly next to the circulatory system • No closed vessels • Most insects hatch from eggs which are formed by sexual reproduction • Insects molt as they grow in size (undergo metamorphosis) • http://video.google.com/videoplay?docid=-7469268265821474672#

  11. Class Arachnid • Spiders are not insects. • Arachnids include spiders, scorpions, mites and ticks. • Arachnids have four pairs of legs. • Two main body sections - abdomen and cephalothorax • This is a joined head and thorax. • No antennae

  12. Subphylum Myriapoda • Myriapod means having many legs. • Millipedes and Centipedes belong to this subphylum of arthropods • Both centipedes and millipedes care for their eggs

  13. Class Chilipoda - Centipedes • One pair of legs per body segment. • Up to 15 to 170 pairs of legs in total • Wriggle when they walk because the legs on either side of their body move alternately. • Centipedes have flat bodies • Centipedes are carnivores • - they have fangs • - may have venomous claws to catch their food. • They can move very quickly. • http://www.youtube.com/watch?v=2f5gBFMMmGc

  14. Class Diplopoda - Millipedes • Two pairs of legs per body segment. • Smooth motion because both legs on either side of their body are moving at the same time. • They have a round tube shape bodies. • Millipedes may give off a bad odor when they are frightened • Vegetarian

  15. Class Maxillopoda : The Barnacles The Barnacle Life Cycle Includes 2 larval stages • NAUPILUS • Floats in the ocean 2. CYPRID • Settles in a safe place • Glues itself headfirst to surface and undergoes metamorphosis into a barnacle

  16. Nauplius larva (barnacle)

  17. Adult Barnacle • develops 6 hard armor plates around its body • feathery legs to capture food and gametes when spawning • Barnacles are hermaphroditic Famous Barnacle Fact: Barnacles have the largest penis to body size ratio of any species in the animal kingdom

  18. Goose barnacles feeding http://www.youtube.com/watch?v=v1SW-pl2gYs&feature=related

  19. Class Malacostraca • Cephalothorax • almost completely covered by a carapace • 6 abdominal segments often used for swimming • Stick out the end in shrimps and lobsters • Tucked underneath the body in crabs

  20. Compound eyes • 5 pairs of walking legs, some with modified pincers • 2 chambered stomach • Centralized nervous system Hermit Crab Spiny King Crab

  21. Above: Lobster Above: Pacific White Cleaner Shrimp Left: Decorator Crab: will cover its body in algae etc. in order to camouflage itself with its surroundings

  22. Pair of Lobster Prawn Spiny Lobster Hermit Crab

  23. Ecological Roles of Arthropods • Pollination • Production of honey, wax, and silk • Recycle biological materials to help make topsoil • Form symbiotic relationships with other organisms • Part of food chain http://www.youtube.com/watch?v=SX4ymCik3iQ Burrowing shrimp and Goby fish living together

  24. The Largest living Arthropod… …is the Japanese Spider Crab with a leg span of 4 meters and a weight of 20kg. This crab has a life expectancy of 100 years.

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