Unit 8 Chapter 28 Arthropods. What is an Arthropod? Bilaterally symmetrical, segmented coelomates...
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Transcript of Unit 8 Chapter 28 Arthropods. What is an Arthropod? Bilaterally symmetrical, segmented coelomates...
![Page 1: Unit 8 Chapter 28 Arthropods. What is an Arthropod? Bilaterally symmetrical, segmented coelomates Segmented body, exoskeleton & jointed appendages Appendages.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bf7b1a28abf838c83ca7/html5/thumbnails/1.jpg)
Unit 8Chapter 28Arthropods
![Page 2: Unit 8 Chapter 28 Arthropods. What is an Arthropod? Bilaterally symmetrical, segmented coelomates Segmented body, exoskeleton & jointed appendages Appendages.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bf7b1a28abf838c83ca7/html5/thumbnails/2.jpg)
What is an Arthropod?
Bilaterally symmetrical, segmented coelomates
Segmented body, exoskeleton & jointed appendages
Appendages = body outgrowths
![Page 3: Unit 8 Chapter 28 Arthropods. What is an Arthropod? Bilaterally symmetrical, segmented coelomates Segmented body, exoskeleton & jointed appendages Appendages.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bf7b1a28abf838c83ca7/html5/thumbnails/3.jpg)
What is an Arthropod? Arthropods must molt (shed
exoskeleton periodically) Arthropods have variety of
respiration types: gills, tracheal tubes & book lungs
Arthropods have complex digestive and excretory systems: Mandibles (jaws) are used to
classify arthropods
![Page 4: Unit 8 Chapter 28 Arthropods. What is an Arthropod? Bilaterally symmetrical, segmented coelomates Segmented body, exoskeleton & jointed appendages Appendages.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bf7b1a28abf838c83ca7/html5/thumbnails/4.jpg)
What is an Arthropod? Arthropods have well-developed senses: Pheromones = chemical odor signals given
off by animals (detected by others) Compound eyes =
visual structure with many lenses
Simple eye = visual structure with only one lens for detecting light
![Page 5: Unit 8 Chapter 28 Arthropods. What is an Arthropod? Bilaterally symmetrical, segmented coelomates Segmented body, exoskeleton & jointed appendages Appendages.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bf7b1a28abf838c83ca7/html5/thumbnails/5.jpg)
What is an Arthropod? Arthropods reproduce sexually:
Some are hermaphroditic, most have internal fertilization
A few have parthenogenesis = new individuals develop from unfertilized eggs
Ex: social insects, such as bees, ants & wasps
![Page 6: Unit 8 Chapter 28 Arthropods. What is an Arthropod? Bilaterally symmetrical, segmented coelomates Segmented body, exoskeleton & jointed appendages Appendages.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bf7b1a28abf838c83ca7/html5/thumbnails/6.jpg)
Diversity of Arthropods
Arachnids Includes spiders,
scorpions, ticks & mites (chiggers)
Two body segments & six pairs of jointed appendages, including 8 legs, 2 chelicerae (fangs) and 2 pedipalps (sensors)
![Page 7: Unit 8 Chapter 28 Arthropods. What is an Arthropod? Bilaterally symmetrical, segmented coelomates Segmented body, exoskeleton & jointed appendages Appendages.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bf7b1a28abf838c83ca7/html5/thumbnails/7.jpg)
Diversity of Arthropods
Crustceans Includes crabs,
lobsters, shrimp, crayfish, pill bugs & barnacles
Two body segments & 2 pair of antennae, 5 pair of legs, and numerous “jaw feet”
![Page 8: Unit 8 Chapter 28 Arthropods. What is an Arthropod? Bilaterally symmetrical, segmented coelomates Segmented body, exoskeleton & jointed appendages Appendages.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bf7b1a28abf838c83ca7/html5/thumbnails/8.jpg)
Diversity of Arthropods Millipedes & Centipedes
Many body segments and paired legs
Millipedes are herbivorous, while centipedes are carnivores
Horseshoe Crabs These “living fossils” have
remained unchanged for 200 million years
![Page 9: Unit 8 Chapter 28 Arthropods. What is an Arthropod? Bilaterally symmetrical, segmented coelomates Segmented body, exoskeleton & jointed appendages Appendages.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bf7b1a28abf838c83ca7/html5/thumbnails/9.jpg)
Diversity of Arthropods Insects…Most successful class in terms of diversity
Includes beetles, butterflies, ants & bees, flies & mosquitoes, and many others
Three body segments, 3 pair of legs, one pair of antennae, and wings
![Page 10: Unit 8 Chapter 28 Arthropods. What is an Arthropod? Bilaterally symmetrical, segmented coelomates Segmented body, exoskeleton & jointed appendages Appendages.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bf7b1a28abf838c83ca7/html5/thumbnails/10.jpg)
Metamorphosis Series of changes in body shape and form
during life history
Incomplete M:
3 stages including nymph (smaller, immature version of adult)
![Page 11: Unit 8 Chapter 28 Arthropods. What is an Arthropod? Bilaterally symmetrical, segmented coelomates Segmented body, exoskeleton & jointed appendages Appendages.](https://reader035.fdocuments.in/reader035/viewer/2022062222/5697bf7b1a28abf838c83ca7/html5/thumbnails/11.jpg)
Complete M: 4 stages including larva (wormlike creature which eats and grows) and pupa (enclosed structure that changes into adult form)
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