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youtube/watch?v=Gg57Idz7Bs4 youtube/watch?v=vP_td9q_344

http://www.youtube.com/watch?v=Gg57Idz7Bs4 http://www.youtube.com/watch?v=vP_td9q_344. General. Name means soft body this is one of the largest animal phyla, besides Arthropoda There are nearly 75,000 species and some 35,000 fossil species Very diverse group (snails, clams, octopus)

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youtube/watch?v=Gg57Idz7Bs4 youtube/watch?v=vP_td9q_344

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  1. http://www.youtube.com/watch?v=Gg57Idz7Bs4 • http://www.youtube.com/watch?v=vP_td9q_344

  2. General Name means soft body this is one of the largest animal phyla, besides Arthropoda There are nearly 75,000 species and some 35,000 fossil species Very diverse group (snails, clams, octopus) Range from simple organisms to some of the most complex invertebrates

  3. Hawaiian Bobtail Squid

  4. Blue Ringed Octopus

  5. Ecological Relationship Habitats: from tropics to polar region ponds, lakes, streams, surf, ocean depths, etc Most live in the sea Include herbivores, carnivores, and filter feeders

  6. Economic Importance many are food for humans produce pearls (most from Eastern Asia) Some molluscs are destructive (Great Lakes, Snails and Slugs in gardens)

  7. Form and Function Body Plan – • consist of head-foot portion (cephalopod) and a visceral mass (nervous system) • head-foot portion – contains feeding, cephalic sensory, and locomotion organs • visceral mass – contains digestive, circulatory, respiratory, and reproductive organs

  8. Form and Function Body Plan – two folds of skin make up a protective “mantle” mantle houses the lungs and secretes a shell in many species

  9. Form and Function Head-foot – many have a well developed head containing sensory organs range from simple to complex eyes Foot is used for locomotion

  10. Form and Function Head-foot – Unique structure inside mouth called “radula” It is a tonguelike found in all molluscs except bivalves (shell fish) Has rows of tiny teeth that point backward It has about 250,000 teeth When protruded, it can scrape, pierce, tear, or cut food material http://www.youtube.com/watch?v=mLVDwlrSq5U&list=TLDlxJTSuqf42kySqHbo0jexNdvt3BkIqS

  11. Form and Function Head-foot – Foot can be adapted for locomotion, attachment, or a combination of functions Some modifications include – “hatchet foot” of bivalves, funnel for jet propulsion in squids and octopi

  12. Form and Function Visceral Mass – (mantle and mantle cavity) mantle – the outside of the skin extending from the visceral hump that runs down each side of the body, protecting soft parts and creating a space

  13. Form and Function Visceral Mass – (mantle and mantle cavity) mantle cavity – houses respiratory organs products from digestive, excretory, and reproduction systems empty into the mantle cavity in aquatic species, surface cilia create water currents that continually flush out waste

  14. Form and Function Visceral Mass – Shell (when present) typically has three layers outer layer Composed of a protein called “conchiolin” Growth only occurs at the edge of the shell middle layer Composed of densely packed prisms of calcium carbonate in a protein matrix Inner layer Composed of calcium carbonate sheets laid down over a thin protein matrix This layer is continuously secreted by mantle surface, so it becomes thicker during the animals life Calcium for the shell comes from environmental water, soil, or food

  15. a. Outer layer b1. middle layerb2. Inner layer

  16. Form and Function Internal Structure and Function – there is an open circulatory system pumping heart blood vessels blood sinuses closed circulatory system

  17. Form and Function Internal Structure and Function – Digestive tract is highly specialized according to feeding habits Most have a pair of kidneys Ducts of kidneys in many forms serve to discharge eggs and sperm

  18. Form and Function Internal Structure and Function – Nervous System consists of several pairs of ganglia (nerve cells) with connected nerve cords Most molluscs are dioecious Some are hermaphroditic

  19. Mating Leopard Slugs https://www.youtube.com/watch?v=FhVi4Z6CjZk

  20. Class Polyplacophora: Chitons are somewhat flattened and have a surface that bears eight plates, or valves name means “bearing many plates” most are between 2 and 5 cm commonly occur on rocky surfaces in intertidal regions if detached, they can roll up like an Armadillo for protection Sexes are separate

  21. Class Gastropoda (gastro – stomach, podos – foot) By far the largest and most diverse class Contains about 40,000 living species Includes snails, limpets, slugs, whelks, conchs, periwinkles, sea slugs, sea hares, sea butterflies, etc. Often sluggish, sedentary animals Because of heavy shells and slow locomotion organs

  22. Snails

  23. Snails

  24. Limpets (Owl Limpet)

  25. Limpets

  26. Slugs

  27. Whelks

  28. Whelks (Lightening)

  29. Conchs

  30. Conchs

  31. Conchs

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