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Phylum Mollusca Clams, Snails, Octopi, Cuttlefish, Nautilus By: Tanner Clark Key Characteristics Soft body, protected by a shell Body has more than two layers Open circulatory system Pair of kidneys Body possesses a through gut with mouth and anus Bilaterally symmetrical Anatomy Sexual Reproduction Respiration is through gills Blood Flow is controlled by valve Radula bore holes into other animals Mantle is responsible for secreting the shell Digestion Mouth, anus and complex stomach Cells lining the digestive glands Digested food is passed through into the blood Undigested food are passed through anus Discharged through the mantle cavity Respiration Gills assist the ones in water Siphons bring water in and out of the body Land snails use a mantle cavity Diffusion occurs through moist skin Oxygen is carried by circulatory system Internal Transport Open Circulatory System Carried through body by blood Some Mollusca use closed circulatory system Water: Cenidia Blood flows into sinuses Excretion Cellular Metabolism Nephridia eliminates ammonia Nephridia empties into the mantle cavity Metanephridia Undigested foods travel through the anus Response Mollusks are very sensitive Body color can change Pigment cells called chromatophores Snails use antennas to react Mollusks have brains so they are able to react to different circumstances Movement Land: flat sole called a foot Foot contracts to slide over it Water: Jet propulsion Muscle contraction Some are sessile Reproduction Sexual Reproduction Water: external fertilization Land: internal fertilization Some Mollusca are hermaphrodites Complex Reproduction Examples Aplacophora- (Deep-sea creatures) Bivalvia- (clams, oysters) Cephalopoda- (squid, octopuses) Gastropoda- (snails, slugs) Monoplacophora- (Limpet- Like creatures) Polyplacophora- (Chitons) Scaphopoda- (Tusk Shells) Examples Cont.- Facts There is an estimated 100,000 species of mollusks alive today The Giant Squid can grow up to 43 ft. in length The Giant Clam can weigh up to 440 pounds in weight There are 8 different classes of Mollusks Some mollusks are super slow and can only travel 3 feet in a matter of 2 minutes Video http://video.nationalgeographic.com/video/octopus_cy anea_feeding Works Cited http://en.wikipedia.org/wiki/Mollusca http://infusion.allconet.org/webquest/PhylumMollusca. html http://molluscs.weebly.com/reproduction.html http://molluscsf.blogspot.com/2007/03/excretion.html http://www.infoplease.com/encyclopedia/science/moll usca-anatomical-features.html