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=What are molluscs? = | ==What are molluscs? == | ||
They are animals with a bilateral symmetry and an exoskeleton called a shell. There are three different groups of molluscs; the Gastropods, the Cephalopods and the Bivalves. | They are animals with a bilateral symmetry and an exoskeleton called a shell. There are three different groups of molluscs; the Gastropods, the Cephalopods and the Bivalves. | ||
All of them have a body separated in three parts. First part is the foot. Second one the visceral | All of them have a body separated in three parts. First part is the foot is the strong, muscular portion used for locomotion. Second one the visceral mass is the soft-bodeid portion that contains internal organs and the thrid one the mantle is a membraous, or sometimes muscular , covering that envelops the visceral mass | ||
== What are the main features of each group? == | == What are the main features of each group? == | ||
==The Gastropods== | ==The Gastropods== | ||
Version du 10 janvier 2011 à 12:10
What are molluscs?
They are animals with a bilateral symmetry and an exoskeleton called a shell. There are three different groups of molluscs; the Gastropods, the Cephalopods and the Bivalves. All of them have a body separated in three parts. First part is the foot is the strong, muscular portion used for locomotion. Second one the visceral mass is the soft-bodeid portion that contains internal organs and the thrid one the mantle is a membraous, or sometimes muscular , covering that envelops the visceral mass
What are the main features of each group?
The Gastropods
The Gastropods include the snails and the slugs. Some of them live into the water. These molluscs can be unisexual or hermaphrodite. The Gastropods have a stomach-footed. They move by muscle contractions. They can have a shell like the snails. Their body is separated in three parts.
The Cephalopods
tantaculas, swim by jet projection energy-consuming mode of locomotion
The Bivalves
What are the main features of animals?
Are molluscs animals?
References
Essential Biology with Physiology Campbell/Reece/Simon Second Edition