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Mollusk. Presented to you by Sequoya Hawkins and Samantha Swanik. Basic Information. Phylum Name: Mollusca Largest Marine Phylum Were one of the most successful of all animal groups Live in: Marine environments Freshwater environments Terrestrial environments Inhabiting trees

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mollusk

Mollusk

Presented to you by Sequoya Hawkins and Samantha Swanik

basic information
Basic Information

Phylum Name: Mollusca

Largest Marine Phylum

Were one of the most successful of all animal groups

Live in:

Marine environments

Freshwater environments

Terrestrial environments

Inhabiting trees

Gardens

Streams

Estuaries

Tidal Pools

Beaches

The Continental Shelf

Deep Ocean

diversity of mollusks
Diversity of Mollusks

Over 150,000 species

Gastropods

Phylum name: Gastropoda

More commonly known as slugs and snails

Most diverse class

60,000 to 80,000 species

diversity of mollusks cont d
Diversity of Mollusks (cont’d)

Bivalves

Phylum: Bivalvia

Have two part shells

Has 30,000 species

Exclusively aquatic

Other names:

Bivalva

Pelecypoda

Lamellibranchia

diversity of mollusks cont d1
Diversity of Mollusks (cont’d)

Cephalopods

Phylum: Cephalopoda

The dominant large predators

Appeared over 500 million years ago

Image-forming eyes

Chitinous beaks

Includes:

Octopods

Squids

Nautiluses

characteristics
Characteristics

All have muscular mass of tissue called a foot

  • Mollusk foot functions in locomotion

Multifunctional structure called a mantle

Mollusk foot functions in locomotion

An outgrowth of body surface that drapes over animal

Rasping organ called a radula

Have a coelom

Open circulatory system

body support skeleton and movement
Body Support, Skeleton, and Movement
  • Mantle produces a shell
    • In most species
  • 3 Grouping of Mollusk:
    • Hatchet-footed
      • Live inside 2 shells
      • Referred to as bivalves
    • Belly-footed
      • 1 spiral shell
      • Carry shells on back
      • Called univalves
    • Head-footed
      • Definite head surrounded by tentacles
reproduction
Reproduction
  • Sexual
  • Male and female structures are present in same individual
    • Except in polychaetes
    • Some snails are hermaphroditic
    • Sea slugs and oysters can change sex repeatedly
  • Internal fertilization
    • External in polychaetes
  • Reproduces with a large organ called a gonad
digestion
Digestion
  • Complete digestive tract (tube)
    • Has openings at both ends
      • Mouth and anus
    • Has specialized regions for digestion
      • The stomach and intestine
  • Steps in Mollusk digestion
    • Food brought through siphon system
    • Goes to mouth
    • Goes to digestive gland
    • Goes to intestine
    • Waste leaves via the anus
examples of mollusks
Examples of Mollusks
  • Snails
    • Nudibranchs
  • Slugs
  • Oysters
  • Clams
  • Octopuses
  • Squids
  • http://video.nationalgeographic.com/video/player/kids/animals-pets-kids/invertebrates-kids/nudibranch-kids.html
bibliography
Bibliography
  • http://www.historyoftheuniverse.com/mollusc.html
  • http://geology.er.usgs.gov/paleo/mollusks.shtml
  • http://tolweb.org/Cephalopoda
  • http://www.earlham.edu/~burksje/mollusk%20pic.gif
  • http://www.mcwdn.org/Animals/Mollusks.html
  • http://www.jochemnet.de/fiu/BSC1011/BSC1011_13/tsld005.htm