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Characteristics of Mollusca (Dorsal body wall forms folds called mantle,…
Characteristics of Mollusca
Dorsal body wall forms folds called mantle
The mantle is modified into ctenidia (gills) or lung and secretes the shell
Muscular foot is present
Radula is present
Aquatic and terrestrial representatives
Open circulatory system except in cephalopods, which have a secondarily closed system: 3 chambered heart, blood vessels, sinuses, respiratory pigments in blood
Bilateral symmetry
Unsegmented; a definite head often present
Triploblastic with coelom
Surface epithelium ciliated with mucus glands and sensory nerve endings
Complex digestive system
Anus empties into the mantle cavity
Nervous system of paired ganglia with nerve cords. Ganglia are centralized nerve ring in gastropods and cephalopods
Touch, smell, taste, equilibrium and visual sensory organs present
Sexual reproduction
Monoecious and dioecious forms
One or two
Metanephridia
(kidneys) open into the pericardial cavity and usually empty into the mantle cavity
Gaseous exchange is by ctenidia (gills), lungs, mantle or body surface
Free-living and parasitic