logging in or signing up MOLLUSKS 4 13 07 Penelope Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 2255 Category: Education License: All Rights Reserved Like it (4) Dislike it (0) Added: January 08, 2008 This Presentation is Public Favorites: 2 Presentation Description No description available. Comments Posting comment... By: LadyFatima (38 month(s) ago) NICE :) Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript MOLLUSKS: MOLLUSKS 100,000 plus species Live everywhere – ocean, streams, tree tops, etc. Soft bodied animals Have an internal or external shellFORM & FUNCTION: FORM & FUNCTION 4 Basic Parts Foot Mouth/feeding parts Mantle Delicate tissue layer that covers most of body Shell Made by glands in mantle that secrete Calcium Carbonate Visceral Mass Contains the internal organsFEEDING: FEEDING Every type found: herbivore, carnivore, omnivore, filter feeder, detritus feeder, and parasitic Radula – think sandpaper Snails and slugs Tongue like structure with 100’s tiny teeth Inside is a stiff rod of cartilage Used to bring in food or drill through shellFEEDING: FEEDING Octopi Have radula and sharp jaws Can poison their prey Clams, Oysters, and Scallops Filter feeders Use gills and cilia to move food into the mouth RESPIRATION: RESPIRATION Breath using their gills and in the mantle cavity Have to keep the surface area moist, stay in/around water to breathINTERNAL TRANSPORT: INTERNAL TRANSPORT Both open and closed circulatory systems Snails and slugs – open circulatory system Blood moves in vessels and sinus cavities Not efficient, but slow moving so it works Octopi – closed circulatory system Blood moves in blood vessels Faster moving EXCRETION: EXCRETION Solid waste removal – Anus Cell waste removal – Nephridia Produce ammonia – poisonous to the molluskRESPONSE: RESPONSE Simple Ganglia near mouth, few nerve cords, simple sense organs – balance, touch, chemical and eyespots Complex Brain, nervous system – see, touch, intelligence Octopi Can be reward/punish trainedREPRODUCTION: REPRODUCTION External Fertilization Sexes are seperate Release sperm and egg into the open water Meet by chance Internal Fertilization Sexes separate or in same organismsGASTROPODS: GASTROPODS Snail, slug, abalone, conch, etc. Think shellfish Means stomach foot Both shell and shell-less Shell for protection Shell-less: bad tasting or poisonousBivalvia: Bivalvia Two-shelled mollusks Clams, oysters, and scallops Sessile Burrow, stick to rocks Can move by flapping their shells Mantle glands Make exterior shell Release mother-of-pearl on inside of shell to keep it smooth: how a pearl is made CEPHALOPODS: CEPHALOPODS Means head-foot – head is attached to the foot Octopi, squid, cuttlefish, and nautiluses Most have 8 tentacles with round sucking discs Discs used to grab and hold prey Bilateral body symmetry Most have internal shell or no shell Shell for protection No shell can swim or crawl fast – use jet propulsion, release ink that has a foul taste to get awayCEPHALOPODS: CEPHALOPODS Most active Mollusk Can change colors to adapt to their environment Caused by chromatophore cells – special skin cells MOLLUSK IMPACTS: MOLLUSK IMPACTS Feed on plants – slugs, snails Prey on other animals Clean-up surroundings by eating detritus Filter feeders – environmental monitors Pollutants become concentrated in tissues Food source for people and other animals May contain high amounts of pathogens, toxins, or pollutants – can cause sickness or deathMOLLUSKS IN ACTION: MOLLUSKS IN ACTION http://video.pbs.org:8080/ramgen/wnet/nature/octopus/sharkT1.rm White-lipped snail Leopard Slug, Somerville, MA Information courtesy of wikipedia.com, nova, marine bay, and pbs http://www.pbs.org/wgbh/nova/camo/ http://www.mbayaq.org/video/video_slippersnail_feeding_qt.aspMOLLUSKS NOT IN ACTION: MOLLUSKS NOT IN ACTION Oyster Sauce Octopuses at Tsukiji fish market Fried calamari: breaded, deep-fried squid.MONDAY - CLAM: MONDAY - CLAM CLAM Kingdom: Animalia Phylum: Mollusca Class: Bivalvia You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.