1 / 14

Mollusks

Mollusks. Chapter 10 Section 1. Clams, oysters, scallops, snails, squids Invertebrates with soft, unsegmented bodies Often protected by hard outer shell (protects soft body) Mantle: thin layer of tissue that covers internal organ, produces the hard shell

madison
Download Presentation

Mollusks

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. Mollusks Chapter 10 Section 1

  2. Clams, oysters, scallops, snails, squids • Invertebrates with soft, unsegmented bodies • Often protected by hard outer shell (protects soft body) • Mantle: thin layer of tissue that covers internal organ, produces the hard shell • Foot: adapted for crawling, digging, catching prey Characteristics of Mollusks

  3. Bilateral symmetry • Digestive system, 2 openings • Internal organs located in one area Mollusk: Body Structure

  4. Body Structures

  5. Open circulatory system • Blood is not inside blood vessels • Blood sloshes over the organs and returns eventually to the heart Mollusks: Circulatory System

  6. Mollusks that live in water have gills • Gills: organs that remove oxygen from the water • Cilia: tiny, hairlike structures that move water over the gills Mollusks: Obtaining Oxygen

  7. GASTROPODS • BIVALVES • CEPHALOPODS • Classified by… presence of shell, type of shell, type of foot, complexity of nervous system Three Major Groups of Mollusks

  8. Snails and slugs • Largest group of mollusks • Live everywhere on Earth • Single external shell or no shell at all GASTROPODS

  9. Herbivores • Eat only plants • Carnivores • Animals that eat only other animals • Scavengers • Radula: a flexible ribbon of tiny teeth that scrapes food from a surface GASTROPODS: Obtaining Food

  10. Oysters, clams, scallops, mussels • Mollusks that have two shells held together by hinges and strong muscles • NO RADULAS, strain tiny organisms from water with the use of their gills • Omnivores: eat both plants and animals BIVALVES

  11. Oysters and mussels attach themselves to rocks or underwater surfaces • Clams can burrow the mud by changing the shape of its foot • Grain of sand gets stuck between mantle and shell… PEARL! BIVALVES (cont.)

  12. Octopus, squids, nautilus, cuttlefish • Ocean dwelling mollusk whose foot is adapted to form tentacles around its mouth • Carnivores • Use tentacles containing sensitive suckers to capture food • Suckers receive sensations of taste as well as touch • Don’t have to touch something to taste it CEPHALOPODS

  13. Large eyes • Excellent vision • Most complex nervous system of any invertebrate • Large brains, can remember things they have learned • Jet propulsion CEPHALOPODS (cont.)

  14. An Escaping Octopus

More Related