1 / 11

Mollusk

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

helen
Télécharger la présentation

Mollusk

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. Mollusk Presented to you by Sequoya Hawkins and Samantha Swanik

  2. 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

  3. 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

  4. Diversity of Mollusks (cont’d) Bivalves Phylum: Bivalvia Have two part shells Has 30,000 species Exclusively aquatic Other names: Bivalva Pelecypoda Lamellibranchia

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

More Related