Monday, November 22, 2010

Tough Exoskeletons Are Sea Shells

Seashells are a ubiquitous feature of beach however; every shell is really a natural remnant from an organism, which once lived. Many of these shell-producing species are called Sea Shells as well as mollusks are helpful for preventing their soft bodies. Now, let us have a look at sea shell systematic classification.

Mollusks: Seashells are generally tough exoskeletons made by mollusks however; few crustaceans of arthropod phylum like crabs even produce shells.

Even if, vision is poor in many mollusks, cephalopods like squid have eyes with retinas, lenses as well as other features wonderfully like those of vertebrates. Few gastropods have best developed sense of smell and may locate food in water at a substantial distance. Predators can similarly be noticed by chemical senses as well as sometimes eliminated by leaping. Few mollusks exhibit difficult courtship behavior.

Gastropods: These shells from snails have a spiral shell. Slugs are gastropods however have no shells.

Sometimes, hermit crabs were discarded gastropod shells for protecting their soft bodies.

Bivalves: Polyplacophorans are a usual kind of mollusk shell made of two shells hinged together.

Bivalve creatures include oysters, scallops and mussels. These organisms have no head, relying on species and they eat passing plankton, which floats by. Shell beach in Western Australia is nearly covered by discarded bivalve shells.

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