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Mollusca

Mollusca. By Kelsey Neichin and Aaron Thomsen. Phylum. Mollusca All soft-bodied animals Most protected by calcium carbonate shell 3 main body parts: foot, visceral mass, mantle. Sample Animals. Polyplacophora (Chitons):. Gastropoda (snails and slugs):.

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Mollusca

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  1. Mollusca By Kelsey Neichin and Aaron Thomsen

  2. Phylum • Mollusca • All soft-bodied animals • Most protected by calcium carbonate shell • 3 main body parts: foot, visceral mass, mantle.

  3. Sample Animals Polyplacophora (Chitons): Gastropoda (snails and slugs): http://www.museum.wa.gov.au/dampier/images/explore/mollusc/chitons/chiton01.jpg http://pirun.ku.ac.th/~b5044115/Gary_the_snail.png Bivalvia (clams, mussels, scallops, oysters): Cephalopoda (squids, octopuses, cuttlefish, chambered nautiluses): http://www.octopusmobile.com/wp-content/uploads/2009/10/BlueRingedOctopus.jpg http://www.barrierreefaustralia.com/IMAGEGALLERY/giant-clam.jpg

  4. Body Cavity and Symmetry • Mollusks possess a coelom. • Bilateral

  5. Nervous System • Relatively complex nervous system • Octopus is the most complex. • The octopus is thought to be among the most intelligent of all invertebrates, with a mental capacity equal to a domestic cat. • Strong senses • Variety of organ systems • Large, complex eyes.

  6. Circulatory System • Open circulatory system • Blood is collected from the gills-- pumped through the heart-- released into spaces in the tissues-- returns to the gills and then to the heart.

  7. Digestive System • The digestive tract is complete • Ciliated • Mouth, anus and complex stomach

  8. Excretory System • Excretory functions carried out by a pair of nephridia (tubular structures that collect fluids from the coelom and exchange salts and other substances with body tissues) • The nephridia empty into the mantle cavity.

  9. Locomotion • Herbivores= gliders (waves of muscular contraction) • Cephalopods= jet propulsion, in which water is rapidly expelled from the mantle cavity out of the siphon • Squid is the fastest of any aquatic invertebrate • Bivalves= foot developed into a tool for burrowing

  10. Skeletal Type • Invertebrates (All soft bodied) • Most have hard calcium carbonate shell • Some lost shells completely during their evolution i.e. slugs, squids and octopuses • Polyplacophora: shell with 8 plates • Gastropoda: usually coiled shell • Bivalvia: flat shell w/ 2 valves • Cephalopoda: internal or external; some absent

  11. Sensory Structures • Large, complex eyes • Squid have specialized polarization vision, which allows them to successfully locate and capture transparent prey in water.

  12. Reproduction • Sexually • Most stay one sex for their entire life • Some are hermaphrodites and function as both male and female

  13. Gas Exchange • Use gills with extensive capillary network and countercurrent flow for gas exchange.

  14. Other http://www.ucmp.berkeley.edu/taxa/inverts/mollusca/mollusca.php http://www.theanimationblog.com/wp-content/uploads/2009/02/ep-107-a-giant-squidward_0011_1.jpg http://www.ucmp.berkeley.edu/taxa/inverts/mollusca/mollusca.php

  15. Quiz Question 1 • What is the fastest invertebrate? a.Bear b.Squid c.Snails d.Octopus e. None of the above.

  16. Quiz Question 2 • Snails are a part of the ______ class. a. Polyplacophora b. Bivalvia c. Cephalopoda d. Gastropoda e. None of the above

  17. Quiz Question 3 • Most Mollusks have a shell made of what substance? a. Cartilage b. Bone c. Calcium carbonate d. Titanium e. None of the above

  18. Quiz Question 4 • True or false. Do Mollusks have a nervous system?

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