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The mollusk is an invertebrate. An invertebrate is an animal lacking a backbone, such as an arthropod, mollusk, annelid, ect. The Mollusca family is a large phylum of invertebrate animals. There around 85,000 kinds of mollusks.The phylum Mollusca is the largest and most diverse phylum of animals next to arthropods. Mollusks can be found in nearly every ecosystem on Earth, from high, barren mountains to grassy plains, lakes, rivers and in all seas and oceans. New species of mollusks are being encountered and named every year as new discoveries are made in the ocean and tropical rainforests.
Mollusks have three body regions.
1. The head contains the "brain" and the sense organs. 2. The "visceral mass" contains the internal organs. 3. The "foot" is the muscular part of the body.
The body of a mollusk is generally composed of the shell and the fleshy, living part. The fleshy parts of a mollusk can be further divided into the foot and the visceral mass. The foot is a distinctive molluscan feature, adapted in a variety of ways for locomotion. The visceral mass includes the organs for digestion, circulation, reproduction, and respiration. The visceral mass also includes two outside flaps of tissue called the mantle, which secretes the calcareous shell and encloses a mantle cavity. The fluid in the mantle cavity, which in aquatic mollusks is continually replaced with water from the outside, carries away excess water, ions and wastes, and helps circulate nutrients and oxygen. Another structure unique to mollusks, found in most groups except bivalves and a few others is the radula. In most forms the radula is a rasping organ near the mouth variously modified for special feeding techniques.
These two structures – the mantle and radula – are found in Mollusca and nowhere else in the animal kingdom.
Some different types of mollusks include clams, scallops, slugs, snails and even the octopus.Some mollusks live on land, such as the snail and slug. Other mollusks live in water, such as the oyster, mussel, clam, squid and octopus.Land living mollusks, like the snail, move slowly on a flat sole called a foot. Ocean living mollusks move or swim by jet propulsion. They propel themselves by ejecting water from their body.
Other ocean living mollusks, like the oyster, attach themselves to rocks or other surfaces, and can't move. They feed by filtering small food particles from water that flows through them.
Maybe you think that snails, clams, mussels, squid, and octopods are very different. Yet, they are all in the same category of animals known as mollusks and are structurally similar. Mollusks are some of the most well known of invertebrate sea creatures.
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