1 / 28

Arthropods

Arthropods. Chapter 28. Arthropods include :. Insects, Arachnids, Crustaceans, Centipedes. Common characteristics of all arthropods:. Invertebrates -no backbone Bilateral symmetry- divide into 2 equal sides at one point Coelom - cavity around internal organs

dustinjames
Télécharger la présentation

Arthropods

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Arthropods Chapter 28

  2. Arthropods include: • Insects, Arachnids, Crustaceans, Centipedes

  3. Common characteristics of all arthropods: • Invertebrates-no backbone • Bilateral symmetry- divide into 2 equal sides at one point • Coelom- cavity around internal organs • Exoskeleton-outside body skeleton • Jointed appendages- structures growing out of body have joints • Open circulatory system –blood pools in spaces (not vessels)

  4. Common characteristics cont… 7. Complete digestive system -mouth, intestines, stomach, anus 8. Mandibles-a variety of jaws/ Functions: hold, chew, suck, and bite

  5. Appendages • Used for 1. locomotion, 2. sensing, 3. feeding, 4. mating

  6. Exoskeleton • Hard thick covering made of protein & chitin • May be solid all over body or may be in segments Functions 1. Protect 2. Support internal tissues 3. A place of attachment for muscles, prevents 4. Water loss

  7. Exoskeleton growth • Can’t grow as the body grows • They must shed the old skeleton & grow a new one/process called molting • The new skeleton will grow underneath & eventually pop off the old one • Most arthropods molt 4-7 times in life

  8. Most arthropods have 3 segments to their body These include: -The head -The thorax (chest area) -The abdomen

  9. How do arthropods breathe (respire)? 1. Aquatic arthropods-use gills ex. Crayfish

  10. Breathing cont… 2. Most insects use tracheal tubes -branching networks of hollow air passages that carry air through body. -Muscles pump air through the tubes to openings called spiracles. Ex. grasshopper

  11. Breathing cont… 3. Arachnids use book lungs -these air chambers are stacked like books Ex. Spider

  12. Arthropods have acute (very good) senses • Quick movement Ex. Fly • Antennae-use to detect and communicate • Pheromones-chemicals used to signal Ex. Ants • Acute vision (simple and compound eyes) -detect motion very well -can see in almost all directions except directly behind. Ex. This is why it is hard to hit a fly!

  13. Reproduction in Arthropods • Most have 1 type of sex organ on each (male or female) • A few are hermaphrodites (male & female organs) Types of fertilization -If it lives on land-fertilization is internal -If it lives in water-fertilization is external in water

  14. Arthropod classification: • Kingdom: Animalia • Phylum: Arthropoda • Classes: 4 classes

  15. 4 classes of arthropods • Arachnids-spiders, scorpions, mites, ticks • Crustaceans-all are aquatic-lobster, shrimp, crayfish

  16. 3. Centipedes & millipedes- they differ on the number of legs on each section & the type of food they eat

  17. Class Insecta: • Includes millions of species (largest group) • Mate only around 1 time in lifetime • Eggs are fertilized internally and shells form around the eggs • Female lays the eggs after they are fertilized • The # of eggs laid is enormous • Purpose: to increase chance of survival

  18. Insect cartoon

  19. Changes insects undergo after hatching: Metamorphosis-series of changes controlled by chemical substances

  20. 2 Types of Metamorphosis: • Complete metamorphosis-has 4 stages (ex. Butterfly) 4 stages: a. Egg b. larva-free living worm-like stage (caterpillar) c. pupa-larva tissue broken down and replaced in a case-cocoon d. adult

  21. Complete metamorphosis:

  22. 2. Incomplete metamorphosis -has 3 stages (Ex. Grasshopper) 3 stages: a. egg b. nymph-smaller version of adult (looks like adult but lacks appendages like wings and cannot reproduce c. adult

  23. Know Insect Structures! • P. 752 Draw and label the grasshopper • Write the functions under each labeled part • Leave in notebook to study for test • Study drawing, functions and notes for test

More Related