1 / 12

Molluscs

Molluscs. Characteristic Snails, scallops, slugs, octopus, and squids Soft body, protected by a shell. Molluscs. Three common characteristics Mantle - soft outer tissue, produces shell Muscular foot - used for locomotion or attachment. Mollusc. Visceral mass - internal organs

aggie
Download Presentation

Molluscs

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. Molluscs • Characteristic • Snails, scallops, slugs, octopus, and squids • Soft body, protected by a shell

  2. Molluscs • Three common characteristics • Mantle - soft outer tissue, produces shell • Muscular foot - used for locomotion or attachment

  3. Mollusc • Visceral mass - internal organs • Some mollusks have an open circulatory system

  4. Mollusc • Movement • Slide - snails and slugs • Burrow - clams • Expel water - octopus and squid • Sessile - oysters

  5. Mollusc • Digestion • Double opening digestive tract • Straight - more primitive • Coiled - longer, increases the time food is digested • Eating • Filter feeders • Herbivores • Carnivores

  6. Mollusc • Nervous system • Range from barely any nervous system to highly advanced nervous system • Reproduction • Separate sexes • Reproduce sexually

  7. Mollusc • Origin and Diversity • 100,000 species • Coelomates - true coelom

  8. Mollusc • Classification • Shell type • Foot structure • Internal body arrangement • 7 Classes

  9. Mollusc • Polyplacophora - Chitons • Eight overlaping plates • Radula - tongue lined with teeth

  10. Mollusc • Gastropoda • Largest class • Snails and conches • More complex nervous system

  11. Mollusc • Bivalvia • Clam, mussel, scallop, oyster • Two shelled organisms • Filter feeders

  12. Mollusc • Cephalopoda • Nautiluses, cuttlefish, squid, octopus • Existed for 500 million years • Complex nervous system • Closed circulatory system

More Related