mollusks have no legs, although some have flexible tentacles to sense the environment or grab things. Most mollusk species grow hard shells for protection, but they only grow one or two pieces. …some snail populations have stopped growing shells; they are called slugs.

Do mollusks have feet?

mollusk have a muscular foot, used for locomotion and anchoring, which vary in shape and function, depending on the type of mollusk studied. In shelled mollusks, this foot is usually the same size as the opening of the shell.

Do mollusks have bones?

The shells you find on the beach are actually the « skeletons » of invertebrates called mollusks. Unlike the human internal skeleton, Mollusks actually have an exoskeleton. This exoskeleton protects the animal’s soft internal body parts and acts as a sight line for muscle attachment.

What body parts do all mollusks have?

Mollusk bodies can generally be divided into three regions: head, feet, and a group of internal organs called visceral massesThe visceral mass includes many of the organs mentioned in the previous concept, such as the stomach, heart, kidneys, and gonads.

Do all mollusks have tentacles?

Most mollusks have tentacles for feeding and sensing, and many people have well muscled feet. Molluscs also have body cavities, complete digestive systems, and specialized excretory organs. Most mollusks live in the ocean.

Molluscs | Gastropods – Bivalves – Cephalopods |

31 related questions found

Are tentacles a weapon?

Octopuses have eight appendages, each with rows of suckers. But these are not tentacles—in strict anatomical terms, they are weapons. The tentacles have suction cups only on their cushioned ends. Squid and cuttlefish have arms and tentacles.

Are crabs mollusks?

shrimp and Crabs are not mollusks. They belong to the phylum Crustaceans. Crustaceans are not true filter feeders, such as clams, mussels, oysters, and scallops in the phylum Molluscs, the subphylum Bivalve, and generally do not filter dinoflagellates for food.

Which body part is not usually found in mollusks?

mollusks no fully developed lungIn contrast, aquatic mollusks breathe through gills, while terrestrial mollusks have membranes that function like primitive lungs. Extending from the visceral mass are folds of protective tissue called the mantle.

What 3 body areas do all mollusks share?

Although one may not see an obvious physical relationship between snails and squid, they are very similar in structure. Generally speaking, mollusks have 3 body regions: A head, a mass of viscera, and a « foot ».” The head contains the sense organs and the “brain,” while the gut contains the internal organs.

Do mollusks have body cavities?

Both mollusks and annelids likely evolved from free-living flatworms. …but mollusks have evolved real body cavity, an internal coelom surrounded by a mesoderm membrane. However, the body cavity of mollusks strangely narrows to a small space around the heart, sometimes called the blood cavity.

Are turtles mollusks?

mollusks are not a member Zerg, but many people think it is. … mollusks may or may not have shells. This is not how you differentiate mollusks. Other animals have shells, such as turtles. However, mollusks are often considered pesks and hunted in gardens with small children.

Are mollusks cold-blooded?

mollusks have soft bodies, cold blooded invertebrates It is covered with a shell made of calcium carbonate.

Do mollusks have spines?

What is an invertebrate?invertebrates are no spine. Spiny animals are called vertebrates. For example, humans and other mammals, as well as fish, birds, reptiles, and amphibians, are vertebrates.

Why are snails mollusks?

Most gastropods have only one, Usually helical, coiled shell into which the body can retract…the shells of these creatures are usually found during fossil excavations.

How are bivalve feet different from cephalopod feet or snail feet?

The feet of bivalves are a singular mass.its main purpose is for burrowing or digging. Cephalopod feet consist of tentacles and sucker-like structures used for locomotion and hunting. The snail foot is also an exotic mass, but is primarily used for crawling-like locomotion.

What are clam feet called?

Clams are marine mollusks with two valves or shells. Like all mollusks, clams have a mantle surrounding their soft body. It also has a muscular foot that enables the clam to burrow in dirt or sand.The soft tissue above the foot is called visceral mass And contains the body parts of clams.

Do mollusks have brains?

Molluscs, except the most developed cephalopods, no brain in the strict senseInstead, the cell bodies (pericarya) of nerve cells are concentrated in ganglia (ganglia) in important parts of the body. …In gastropods, ganglia are initially dispersed throughout the body.

Do mollusks have nervous systems?

In the typical nervous system of mollusks, there is a pair of cranial ganglia (nerve cell bodies) Innervate the head, mouth and associated sensory organs. This organ degenerates in scaphopods, some cephalopods, and some gastropods. …

What do most aquatic mollusks breathe?

aquatic mollusk « breathe » under water with gills.gill Yes Filaments that absorb and exchange gases between the blood and the surrounding environment water. mollusk There is a circulatory system with one or two hearts that pump blood.

Which type of mollusk has the largest individual?

Gastropoda. gastropod Forms the largest group of mollusks, including snails and slugs. They make up more than 80% of all extant mollusk species and are the only mollusk group with terrestrial species.

Do mollusks have digestive systems?

clams (and all mollusks) Have a complete digestive system. It consists of the mouth for ingesting food, a short connecting tube called the esophagus, the stomach that temporarily holds the food, and the intestines that carry out the digestion and absorption of the food. … food is distributed to the cells of the body through the blood.

What two other parts do all mollusks have?

All mollusks have Gut block, mantle and feet. Visceral mass contains digestive, excretory and reproductive organs. The mantle is a covering. It may secrete a shell.

What seafood is not shellfish?

Crustaceans, such as shrimp, crab or lobster. Mollusks such as clams, mussels, oysters, scallops, octopus or squid.

Is squid fish or shellfish?

animals in the ocean shellfish Includes crustaceans and mollusks such as shrimp, crab, lobster, squid, oysters, scallops, etc.

Do shellfish have blood?

Crustaceans have a open circulatory system This means that all of their blood is not contained within the blood vessels, but is drawn into the heart through holes called ostia, where it is pumped out again to circulate through the tissues and back to the heart again.