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Invertebrates The final chapter

Invertebrates The final chapter. Invertebrates. Review: Acoelomate ….. coelmates ….. Last labs - Today. Invertebrates. Review: Animals are distinguished by their body cavity or lack of. Invertebrates. Review: Coelomates – have a body cavity(s)

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Invertebrates The final chapter

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  1. InvertebratesThe final chapter

  2. Invertebrates Review: • Acoelomate…..coelmates….. • Last labs - Today

  3. Invertebrates • Review: • Animals are distinguished by their body cavity or lack of.

  4. Invertebrates • Review: • Coelomates – have a body cavity(s) • Digestive system and body wall can move independently • Internal organs can be more complex • Coelomic fluid can assist with respiration, circulation, excretion

  5. Invertebrate Coelomates • We will look at two Phylum today • Phylum Echinodermata---Echinoderms • Phylum Arthropoda – Arthropods We will dissect three specimens today

  6. Invertebrate Coelomates • Phylum Echinodermata---Echinoderms • Distinguishing characteristics: • 1. Pentamerous symmetry in adults • 2. Hard endoskeleton - do not present cephalization • 3. Water vascular system • 4. All echinoderms are marine; none can live in fresh water or on land • 5. Moving castles

  7. Invertebrate Coelomates • Phylum Echinodermata---Echinoderms • Water vascular system • locomotion, food / waste transportation ,andrespiration • a system of canals containing a circulating watery fluid that is used for movement of tentacles

  8. Invertebrate Coelomates • Phylum Echinodermata---Echinoderms Reproductive system -sexually mature at two to three years, depending on the species and environment - typically by external fertilization; eggs and sperm are freely discharged into the water

  9. Invertebrate Coelomates • Phylum Echinodermata---Echinoderms Nervous system Decentralized nervous system- -No known echinoderm contains anything that could be called a brain (interlacing) • - diffuse network of nerves and neurons

  10. Invertebrate Coelomates • Phylum Echinodermata---Echinoderms • Circulatory systems Open circulatory system • no true heart or anything that more than merely resembles a circulatory system. • Water vascular system

  11. Invertebrate Coelomates Phylum Echinodermata---Echinoderms Respiratory system -not well-defined Digestive system – complete digestive system, varies according to diet

  12. Invertebrate CoelomatesPhylum Echinodermata---Echinoderms • Many echinoderms have remarkable powers of regeneration • Valuable clues as to the geological history of the environment • Food source – sea cumbers and urchins • Summer time!! • Sea urchins, if not controlled by predators, may overgraze their habitat • Crown of thorns starfish can wipe out up to 6 square meters of living reef in a single year http://www.youtube.com/watch?v=HG17TsgV_qI

  13. Invertebrate Coelomates • Today's Echinoderm Dissection –Starfish • 20 minutes for dissection • Use dissection in your lab book • FOLLOWING DIRECTIONS EXACTLY

  14. Invertebrates • Phylum Arthropoda – Arthropods • There are five main characteristics all arthropods share. • bilateral symmetry - the left and right sides of the arthropod body are mirror images of one another • segmented body - the arthropod body is made-up of repeating units (pairs of legs, claws, or breathing structures) • exoskeleton - provides protection, prevents water loss, and provides support • jointed appendages - enable the arthropods to move their legs, mouthparts, and claws despite the fact that their body is covered by a rigid exoskeleton • numerous pairs of limbs - arthropods have many pairs of legs

  15. Invertebrates • By nearly any measure, the most successful animals on the planet are the arthropods • The true number of living arthropod species is probably in the tens of million • So……………………

  16. Let’s talk about Crayfish……..( first)

  17. Invertebrate Coelomates Phylum Arthropoda – Arthropods Reproductive system – varies crawfish -very similar to most mammals, with their reproductive organs being found in the thorax -male will deposit sperm inside the female

  18. Invertebrate Coelomates Phylum Arthropoda – Arthropods Digestive system -Arthropods exhibit every type of feeding mode • Crawfish - consume food through the mouth's mandibles… stomach for grinding food and a gland for chemical processing

  19. Invertebrate Coelomates Phylum Arthropoda – Arthropods • Nervous system • Typically consists of a dorsal brain and a ventral, longitudinal nerve cord • “Latter like”

  20. Invertebrate Coelomates • Phylum Arthropoda – Arthropods Circulatory systems usuallyposses an open circulatory system consisting of a dorsal heart and a system of arteries Crawfish - open circulatory system of the crayfish has no veins

  21. Invertebrate Coelomates • Phylum Arthropoda – Arthropods • Respiratory system –varies • Crayfisha very unique way of breathing ( Molting ?)

  22. Invertebrate Coelomates • The true rock stars of Phylum: Arthropoda • Featuring:

  23. Remember the first day quiz….8.True or False Daddy Long legs are the most venomous spiders in the world. Scientific classification of spiders • Kingdom: Animalia • Phylum: Arthropoda • Class: Arachnida • Order: Araneae

  24. Remember the first day quiz…. • Scientific classification • Kingdom: Animalia • Phylum: Arthropoda • Class: Arachnida • Order: Opiliones • cephalothorax separation • Silk glands • Venom glands

  25. Brazilian Wandering

  26. Invertebrate Coelomates • Phylum Arthropoda – Grasshopper • Circulatory systems – open • Heart contracts propels fluid, • fluid trickles through the tissues and back to the heart

  27. Invertebrate Coelomates Phylum Arthropoda – Grasshopper • Respiratory system - do not breath using lung • Digestive system – complete • foregut, midgut, hindgut Nervous system brain 3 main nerve cords

  28. Invertebrates Coelomates • Phylum Arthropoda – Grasshopper • hardened exoskeleton that is periodically shed during growth

  29. Invertebrates Coelomates • Phylum Arthropoda – Grasshopper • A body divided into three parts

  30. Invertebrates Coelomates -Reproductive system -varies Metamorphosis • There are two types of metamorphosis--incomplete and complete.

  31. Invertebrates Coelomates incomplete Incomplete metamorphosis Complete metamorphosis complete

  32. Invertebrates Coelomates • Good • Bad

  33. Invertebrates Coelomates • For today begin with: • Anatomy of a grasshopper • Complete this dissection in pairs

  34. Dissection Participation Checklist Earthworm 1. Surgeon__________________________________ 2. Head nurse_______________________________ 3. Reader___________________________________ 4. Scribe____________________________________ Squid 1. Surgeon__________________________________ 2. Head nurse_______________________________ 3. Reader___________________________________ 4. Scribe____________________________________ Clean up 1. Dissection disposal__________________________________ 2. Tray cleaning______________________________________ 3. Instrument cleaning__________________________________ 4. Bench cleaning_____________________________________ I agree that I stayed until this lab station was clean and ready for the next lab to attend. 1.__________________________________________________________ 2.__________________________________________________________ 3.__________________________________________________________ 4.__________________________________________________________ ++++++++++++++++++++++++++++++++++++++++++++++++++++++ Professor Felker’s comments: Dissect in this order: • 1. Earthworm • 2. Squid • 3. Grasshopper

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