1 / 34

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)

naeva
Télécharger la présentation

Invertebrates The final chapter

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. 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

More Related