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What is a shelled mollusk?
The mollusc (or mollusk) shell is typically a calcareous exoskeleton which encloses, supports and protects the soft parts of an animal in the phylum Mollusca, which includes snails, clams, tusk shells, and several other classes. Not all shelled molluscs live in the sea; many live on the land and in freshwater.
What is a mollusk with one shell or none?
Gastropods
Gastropods have one shell, or two, or none: beyond the canonical one-shelled snails, there are sacoglossans (Juliidae) that were originally described as bivalves [6], and while slugs and pelagic gastropods have reduced or lost the shell, several groups also possess secondary armour of subdermal calcareous spicules [7].
Do all molluscs have a shell?
Mollusks usually have a shell (although some do not). Mollusks also have an extension of the body wall called the mantle. This portion of the animal’s anatomy is responsible for secreting the shell. The mantle encloses the mantle cavity which contains the Ctenidia (gills), anus and excretory pores.
What is not a mollusk?
Mollusks are soft-bodied invertebrates that exist within hard calcium carbonate shells. Technically, squids and octopi are cephalopod mollusks, though they don’t have shells. You can be allergic to crustaceans but not mollusks, and you can be allergic to mollusks but not crustaceans.
What G is a mollusk?
Mollusks are soft-bodied invertebrates of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.
What are some interesting facts about mollusks?
– Mollusk fact is an interesting topic on this post. Mollusks are the second largest phylum in the animal kingdom after the phylum Arthropoda. Mollusks include all animals with or without soft shells, such as various types of snails, shellfish, and squid and their relatives.[1] – Mollusks are interesting creatures that are found almost in all kinds of weathers with or without shells. Mollusks are soft-bodied invertebrates that have shells to protect them. Snails, squids, shellfish and their relatives belong to the mollusk group.[2] – Mollusks are the second largest phylum in the animal kingdom after the phylum Arthropoda. Currently there are an estimated 75 thousand species, plus 35 thousand species in the fossil record.[3]
What is considered a mollusk?
Definition of mollusk. : any of a large phylum (Mollusca) of invertebrate animals (such as snails, clams, or squids) with a soft unsegmented body usually enclosed in a calcareous shell broadly : shellfish.
What are some examples of phylum Mollusca?
Clam
What are the important characteristics of Mollusca?
One of the characteristics of mollusca is having a soft body and is protected by a hard shell that is bilaterally symmetrical.