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mollusk, also spelled mollusc, any soft-bodied invertebrate of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.
- What makes a mollusc?
- What makes an animal a mollusc?
- How do you classify a mollusc?
- What makes a cephalopod a cephalopod?
- How are mollusc shells formed?
- How molluscs differ from other phylum describe?
- What three characteristics do all molluscs share that make them molluscs?
- What best describes a mollusk?
- Is a slug a mollusc?
- Is an octopus a mollusk or a cephalopod?
- Which of these animal is mollusk?
- Is gastropod a phylum?
- What are the characteristics of gastropods?
What makes a mollusc?
Molluscs are soft bodied, unsegmented animals, with a body organized into a muscular foot, a head, a visceral mass containing most of the organ systems, and a fleshy mantle which secretes the calcareous shell.
What makes an animal a mollusc?
Mollusks are a large group of invertebrate animals. Mollusks have soft bodies, and their bodies are not divided into rings like the segmented worms called annelids . Mollusks don't have legs, though some have flexible tentacles for sensing their environment or grabbing things.
How do you classify a mollusc?
Mollusks can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. These classes are distinguished by, among other criteria, the presence and types of shells they possess.
What makes a cephalopod a cephalopod?
Cephalopod literally means “head foot” in Greek, a reference to the way the cephalopod's head connects to its many arms. The basic cephalopod body plan includes two eyes, a mantle, a funnel (also called a siphon), and at least eight arms.
How are mollusc shells formed?
As mollusks develop in the sea, their mantle tissue absorbs salt and chemicals. They secrete calcium carbonate, which hardens on the outside of their bodies, creating a hard shell. ... The mollusk continues to take in salt and chemicals from the sea and secrete calcium carbonate, which makes its shell grow even bigger.
How molluscs differ from other phylum describe?
Although there is no single feature that all molluscs possess, three features are so common in molluscs that they are used to distinguish them from organisms in other phyla: ... Molluscs have a mantle or mass of soft flesh that covers the soft body and encloses the internal organs.
What three characteristics do all molluscs share that make them molluscs?
Main characteristics of Mollusca :
There are three distinct body zones: a head-foot, a visceral mass and a mantle.
What best describes a mollusk?
mollusk, also spelled mollusc, any soft-bodied invertebrate of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.
Is a slug a mollusc?
slug, any mollusk of the class Gastropoda in which the shell is reduced to an internal plate or a series of granules or is completely absent. The term generally refers to a land snail. ... Marine gastropods of the subclass Opisthobranchia are sometimes called sea slugs (see opisthobranch).
Is an octopus a mollusk or a cephalopod?
octopus, plural octopuses or octopi, in general, any eight-armed cephalopod (octopod) mollusk of the order Octopoda. The true octopuses are members of the genus Octopus, a large group of widely distributed shallow-water cephalopods.
Which of these animal is mollusk?
Mollusks. The mollusk group spans over 50,000 known species. They include snails, clams, oysters, mussels, squid and octopods.
Is gastropod a phylum?
The Class Gastropoda (in Phylum Mollusca) includes the groups pertaining to snails and slugs. The majority of gastropods have a single, usually spirally, coiled shell into which the body can be withdrawn.
What are the characteristics of gastropods?
Most gastropods have a single, usually spirally coiled shell into which the body can be withdrawn, but the shell is lost or reduced some important groups. Gastropods are characterized by "torsion," a process that results in the rotation of the visceral mass and mantle on the foot.
