Henry Guan, Akash Kashyap, and Angus Qian

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1 Henry Guan, Akash Kashyap, and Angus Qian Akash Kashyap

2 Overview 85, 000 species Marine, Terrestrial, Freshwater habitats Very Diverse Classes: Chitons, Gastropods, Bivalves, Cephalopods Shelled cephlapods called ammonites Akash Kashyap

3 Body Cavity and Symmetry Mollusks have a coelom Cephalopod (Octopus, Squid) Exception Visceral mass contains organs Bilateral Symmetry Akash Kashyap

4 Nervous System 2 main nerve cords, 3 in bivalves Visceral internal organs, Pedal foot Ganglia control rooms throughout body Cerebral ganglia = eyes interaction with brain, pedal ganglia = foot, commissures Brain, Cephalopod most developed Akash Kashyap

5 Circulatory System Open circulatory system Small coeloms surround heart and gonads Hemocyanin as oxygen carrier Atria of heart functions as part of excretory system 11_mollusca/images/bivalve_circulatory.jpg Angus Qian

6 Digestive System Most Mollusks have a radula Cephalopods have a beak Mouths contain glands that produce mucus Cilia in the digestive system sort out particles in the mucus Large food particles are sent to the cecum Angus Qian

7 Excretory System Atria of heart filters waste in blood Waste sent to kidneys as urine Nephridia collect salvageable materials (return to body) and remaining materials released in urine Waste sent to mantle for expulsion Artia doesn t filter No Kidney like you see in us.. Use Nephridia (kidney precursor) Angus Qian

8 Locomotive/Musculature All molluscs have a muscular foot In chitins, foot acts as a suction cup In bivalves foot is modified into a burrowing organ In cephalopods foot in used in jet propulsion Gastropods use the mucus produced in the mouth the mouth to slide along Angus Qian

9 Sensory Structures / Features Eyes Big and developed to small and basic Tentacles (Gastropods, Cephalopods) Touch, Smell Statocysts Balance Osphridia Mainly used to test incoming water Helps gills Henry Guan

10 Skeletal Type Mainly Exo-Skeletons Mantle excretes shell Chitin, Conchiolin, Hardened with Calcium Carbonate Squid s have a style, support Slugs, Squid, Octopuses lost shell during evolution mrfbli15mifyiejseclvsvdgg.jpeg Henry Guan

11 Reproduction Mollusks can be hermaphrodites, or dioecious Gonads in visceral mass Larval stage called trochophore Usually external fertilization (No Copulation) Can also go through mating rituals This involves copulation Henry Guan

12 Gas Exchange Gills Filmaents (cilia) help gills Osphridia also help No gills, gasses diffuse through mantle wall Henry Guan

13 Unique Features Largest Eyes in all of Animalia Kingdom Colossal Squid! Up to 46 Feet Largest known Invertebrate Henry Guan

14 Quiz Questions What other system (no Circulatory) do the atria of the heart come into play with?

15 Excretory

16 What are the two main components of the mollusks exoskeleton?

17 Calcium Carbonate Chitin

18 What category in the mollusks do not have coelom?

19 Cephalopods

20 Fertilization for mollusks usually happens where?

21 External Fertilization Usually in the ocean/water

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