There are much more than 50,000 species in this phylum. Mollusks are invertebrates and include octopus, squid, snails, slugs, clams, and oysters and many others. As varied as this phylum is, every its pets include three physical traits. They have what is referred to as the visceral mass, mantle and foot.

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The Mollusk visceral mass consists of body offal – the cradle tract, renal and also reproductive organs.The mantle partially covers the visceral mass and also may secrete a shell in part mollusks.The foot is a muscular framework that has many functions in different mollusks consisting of movement, attachment, and also predation.Many mollusks additionally contain a radula with countless rows of sharp teeth for scraping at food sources.

Habitat: they are found in both salt (marine) and freshwater habitats and on land.


Class Gastropoda The gastropods include snails, slugs, conchs, periwinkles and sea slugs. Habitat: they are discovered in both salt (marine) and also freshwater habitats and also on land. Diet: Some gastropods space herbivores making use of the radula come scrape turn off food particles. Others room carnivores and also use the radula to permeate the shells of their prey. Physical Traits: They have a large, muscular foot top top which lock move gradually along any type of surface and also the visceral mass sits atop the foot. Numerous gastropods have actually shells, though no all. Both the slug and also the sea cheese (nudibranch) lack a shell. Snails and also slugs breathe with respiratory pores, the oxygen being took in directly into the numerous tiny blood vessels of the mantle. In the much more aquatic gastropods, there room gills instead.

Snails have actually an odd development, the young going v a torsion that results in the anus emptying waste out at the back of the head. They have actually a spiral shell and also a difficult plate, called an operculum, that have the right to seal them inside in instance of danger. They have actually a rough, tongue-like structure, called a radula, through which castle scrape away at food. They likewise have two pairs of tentacles, only one bearing eyes at the end.


Using Models to increase Comprehension

To aid students find out the animals of the Mollusk Phylum, print out this black and white diagram that them.

To assist students find out the anatomy that the Mollusks, publish out a black and also white variation of the color following diagrams:

Anatomy the the Snail

Anatomy that the Squid

Anatomy of the Clam


Testing and Assessment

Assess content comprehension about Mollusks (Octopus, Squid, Snails, Clams, etc.) with the Mutiple an option Test.

Assess anatomical vocabulary comprehension through the Snail Anatomy Labeling Page.

Basic exterior Anatomy Labeling the the Snail (for younger students).

Assess anatomical vocabulary comprehension through the Clam Anatomy Labeling Page.

Assess anatomical vocabulary comprehension v the ink Anatomy Labeling Page.

Basic Anatomy that the ink Labeling Page (for younger students).

Basic outside Anatomy that the Octopus Labeling Page (for younger students).




Class Cephalopoda The Cephalopods (Class Cephalopoda) include squid, octopuses and also nautilus. Their surname Cephalopoda method “head footed.” They space all rapid moving s animals. Habitat: They are all found in the ocean. Physical Traits: They have actually a collection of arms or tentacles that circle the “head.” every arm has actually two rows of suction cups. Though the octopus has eight arms, some Cephalopoda have actually a mixture the arms and tentacles. Some having up come 100 tentacles.

Cephalopods have a reasonably complex brain and eyes v good, shade vision. They space thought to be intelligent and can find out from experience.

Squid and also octopuses have actually a funnel structure, called a hyponome, v which they deserve to blow water to move themselves easily along.

Many varieties have squid to relax if threatened and also can change color come escape predators.

Some cephalopods have actually shells to safeguard them, choose the Nautilus, when others have actually an interior skeletal structure prefer the squid. The octopus has actually neither. Diet: They room predators, making use of their eight (or tentacles) to trap prey, and a spicy beak to bite prey. They climate stuff prey into a central mouth.

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Class Bivalvia Bivalves incorporate clams, oysters, mussels and scallops. Habitat: they are discovered in both salt (marine) and also freshwater habitats. Physical Traits: They have two shells connected by a hinge – dubbed the ligament, and kept closeup of the door by an effective muscles. The shells can open and also close when needed, however are usually organized closed by an effective muscles to protect them indigenous predators. All use their muscular foot to accomplish their various lifestyle needs. Clams burrow right into the sandy bottom. Scallops burrow or swim freely, making use of their shell to “clap” water propelling them together needed. Mussels usage their foot to anchor come rocks and also other objects. They have actually gills that are bathed with fresh water (and oxygen) v posterior siphons. They have no head, yet a diffusive nerve network consisted of of three nerve centers (or ganglia) distributed about their visceral mass. Diet: Unlike many mollusks the feed utilizing a rasping tongue, dubbed a radula, bivalves feeding by filtering food particles from the water. They do this through siphoning water over the gills i beg your pardon traps it and also propels it toward the mouth.