CAS BB 191 Lecture Notes - Lecture 7: Radula, Nephridium, Conchiolin

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Sensory organs of touch, smell, taste, equilibrium and vision. Second most diverse group after arthropods ~ 50,000 living species. Range in size from 5mm - 18 meters. Found in diverse habitats; from ocean abyss to land, fresh and marine water. Food, jewelry, destructive to wood, pests and hosts to parasites. Head-foot: mouth, cephalic sensory organs, foot, tentacles, radula, radula: unique to mollusks, rasping, protrusible, tongue like organ covered in as many as 250,000 teeth, foot: locomotion, creeps, secretes mucous. Visceral mass: digestive, circulatory, respiratory and reproductive organs, mantle and mantle cavity, shell: three layers. Periostracum = outer layer made of conchiolin. Prismatic = middle layer of dense calcium carbonate. Nacreous = inner layer of calcium carbonate sheets and nacre. Gas exchange: body surface, mantle, gills or lung. Mouth > radula > stomach > intestine > anus. Metanephridia (kidneys) connect with coelom and empty into mantle cavity. Nervous system of paired ganglia and nerve cords.

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