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The major classes of living mollusks include gastropods, bivalves, and cephalopods (Figure below).
- Gastropods. Gastropods include snails and slugs. They use their foot to crawl. ...
- Bivalves. Bivalves include clams, scallops, oysters, and mussels. ...
- Cephalopods. Cephalopods include the octopus and squid.
- What are the 3 main parts of a molluscan body?
- Do bivalves have a foot?
- What are the 3 types of mollusk?
- What is the foot of a clam called?
- Do mollusks have feet?
- Do cephalopods have a foot?
- Where is the foot of a mollusk?
- Do gastropods have a foot?
- What are the 4 major molluscs?
- What are the 6 molluscs?
- Where is the foot of the clam?
- Do clams have a foot?
- What are the parts of clams?
What are the 3 main parts of a molluscan body?
The mollusk body can generally be divided into three regions: the head, the foot, and a cluster of internal organs called the visceral mass.
Do bivalves have a foot?
Like fish, bivalve mollusks breathe through their gills. As filter feeders, bivalves gather food through their gills. Some bivalves have a pointed, retractable "foot" that protrudes from the shell and digs into the surrounding sediment, effectively enabling the creature to move or burrow.
What are the 3 types of mollusk?
The three major groups of mollusks are gastropods, bivalves, and cephalopods (SEF ul o pods). The largest group is the gastropods. These are mollusks like snails and slugs that have just one shell or no shell at all. Gastropods creep along on their broad foot.
What is the foot of a clam called?
The bivalve foot, unlike that of gastropods, does not have a flat creeping sole but is bladelike (laterally compressed) and pointed for digging. The muscles mainly responsible for movement of the foot are the anterior and posterior pedal retractors. They retract the foot and effect back-and-forth movements.…
Do mollusks have feet?
Mollusks have a muscular foot used for locomotion and anchorage that varies in shape and function, depending on the type of mollusk under study. In shelled mollusks, this foot is usually the same size as the opening of the shell. The foot is a retractable as well as an extendable organ.
Do cephalopods have a foot?
The name cephalopod, in Greek, means "head foot." This name was applied because the foot of the organism is around the head. But cephalopods lack a traditional foot, instead having between eight and ten tentacles attached to their heads.
Where is the foot of a mollusk?
The foot is the ventral-most organ, whereas the mantle is the limiting dorsal organ. Mollusks are eucoelomate, but the coelomic cavity is restricted to a cavity around the heart in adult animals.
Do gastropods have a foot?
Like all other mollusks, gastropods have a foot, which in their case is used for movement. This foot is located underneath the entire length of the body, allowing the gastropod to slowly creep along the surface.
What are the 4 major molluscs?
The five classes are Polyplacophora, Gastropoda, Bivalvia, Scaphopoda and Cephalopoda. The major diversity of species found from two classes namely Gastropoda and bivalvia.
What are the 6 molluscs?
Class Gastropoda – snails, slugs, limpets, whelks, conchs, periwinkles, etc. Class Bivalvia – clams, oysters, mussels, scallops, cockles, shipworms, etc. The Class Scaphopoda contains about 400 species of molluscs called tooth or tusk shells, all of which are marine.
Where is the foot of the clam?
Observe the muscular foot of the clam, which is ventral to the gills. Note the hatchet shape of the foot used to burrow into mud or sand.
Do clams have a foot?
They manage to maneuver their way beneath the seafloor using their foot. Yes, you heard that right, clams have feet! One foot to be exact. They open their shell enough to stick their foot out and shuffle their way into the sand where they hide from predators.
What are the parts of clams?
Locate the following parts of your clam according to the diagram: adductor muscles gills mantle excurrent siphon incurrent siphon stomach mouth foot intestine Page 3 Lift the gills to find the stomach and intestines.
