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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.Most mollusks have tentacles for feeding and sensing, and many have a muscular foot. Mollusks also have a coelom, a complete digestive system, and specialized organs for excretion. The majority of mollusks live in the ocean. Different classes of mollusks have different ways of obtaining food.Class Cephalopoda. The cephalopods are molluscs with large heads and tentacles. Examples of cephalopod molluscs include squid, octopus, cuttlefish, and nautilus (Fig. 3.65).
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Do mollusks often have tentacles?
Most mollusks have tentacles for feeding and sensing, and many have a muscular foot. Mollusks also have a coelom, a complete digestive system, and specialized organs for excretion. The majority of mollusks live in the ocean. Different classes of mollusks have different ways of obtaining food.
Which class of mollusks all have tentacles?
Class Cephalopoda. The cephalopods are molluscs with large heads and tentacles. Examples of cephalopod molluscs include squid, octopus, cuttlefish, and nautilus (Fig. 3.65).
Mollusca | Gastropods-Bivalves-Cephlapods |
Images related to the topicMollusca | Gastropods-Bivalves-Cephlapods |
What do all Mollusca have in common?
Molluscs are a clade of organisms that all have soft bodies which typically have a “head” and a “foot” region. Often their bodies are covered by a hard exoskeleton, as in the shells of snails and clams or the plates of chitons.
Which characteristic do all mollusks have?
WHAT FEATURES DO MOLLUSKS HAVE IN COMMON? As well as a shell, most mollusks have a muscular foot for creeping or burrowing. Some also have a head with sense organs. The soft body includes lungs or gills for breathing, and digestive and reproductive parts, all enclosed by a skinlike organ called the mantle.
Do mussels have tentacles?
Few would have imaged, that there are mussels flying through the sea with flapping shell? With their long tentacles they truly do not resemble a silent river mussel. From the dawn of mankind humans have been harvesting mussels as food.
Do bivalves have tentacles?
Bivalves do not have brains. Since they do not have a head region, their tentacles and eyes are often located along the mantle edge.
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.
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11.8: Mollusks – Biology LibreTexts
Most mollusks have tentacles for feeding and sensing, and many have a muscular foot. Mollusks also have a coelom, a complete digestive system, …
Mollusks – MBGnet
The feet, or arms, of these creatures are connected to their heads, not their bodies. The rest of the body is in front of the head. That’s why they’re called, ” …
DK Nature: Mollusks – Fact Monster
Soft-bodied invertebrates, mollusks include slugs, snails, octopuses, squid, clams, and mussels. Most mollusks have SHELLS to protect them. WHAT FEATURES DO …
Mollusca – Wikipedia
The three most universal features defining modern molluscs are a mantle with a significant cavity used for breathing and excretion, the presence of a radula ( …
What three structures do all mollusks have?
Despite their diversity, mollusks share in common a three-part body plan that includes a head, a foot and a visceral mass.
In which class of Mollusca head tentacles and eyes are not differentiated?
…
Class of mollusca in which head, tentacles and eyes are not differentiable is.
| Question | Class of mollusca in which head, tentacles and eyes are not differentiable is |
|---|---|
| Chapter Name | Mollusca |
| Subject | Biology (more Questions) |
| Class | 12th |
| Type of Answer | Video & Image |
What is unique about Mollusca?
A feature unique to molluscs is a file-like rasping tool called a radula. This structure allows them to scrape algae and other food off rocks and even to drill through the shell of prey or catch fish.
How are molluscs different from other invertebrates?
As nouns the difference between invertebrate and mollusc
is that invertebrate is an animal without vertebrae, ie backbone while mollusc is a soft-bodied invertebrate of the phylum mollusca, typically with a hard shell of one or more pieces.
Mollusks for kids – Invertebrate animals – Science for kids
Images related to the topicMollusks for kids – Invertebrate animals – Science for kids
Do all molluscs have shells?
Not all mollusks have shells, however– there are plenty of species of mollusks without shells. Instead of a shell, their backs are protected by sturdy reinforced skin, scales, spines, or incomplete armored plates. The word “mollusk” comes from the Latin “molluscus,” meaning soft.
Which of the following is not characteristic of a mollusk?
They are triploblastic as they have three primary tissue layers as endoderm, mesoderm and ectoderm. They do not possess a segmented body. So, the correct answer is option B.
Is octopus a mollusk?
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.
Is lobster a mollusk?
Crustaceans are aquatic animals that have jointed legs, a hard shell, and no backbone. Examples include crab, crayfish, lobster, prawns, and shrimp. Most molluscs have a hinged two-part shell and include clams, mussels, oysters, and scallops.
Is jellyfish a mollusk?
…
| Jellyfish | |
|---|---|
| Phylum: | Cnidaria |
| Subphylum: | Medusozoa |
| Groups included |
Is a snail a mollusk?
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.
How are bivalves different from other mollusks?
Primitive bivalves ingest sediment; however, in most species the respiratory gills have become modified into organs of filtration called ctenidia. In keeping with a largely sedentary and deposit-feeding or suspension-feeding lifestyle, bivalves have lost the head and the radular rasping organ typical of most mollusks.
What are the 4 kinds of mollusks?
| Class | Major organisms |
|---|---|
| Gastropoda | all snails and slugs including abalone, limpets, conch, nudibranchs, sea hares, sea butterflies |
| Bivalvia | clams, oysters, scallops, geoducks, mussels, rudists† |
| Polyplacophora | chitons |
| Cephalopoda | squid, octopuses, cuttlefish, nautiluses, Spirula, belemnites†, ammonites† |
What are the 4 basic features of all mollusks?
- The dorsal part of the body wall is a mantle or pallium, which secretes calcareous spicules, plates or shells. …
- There is a soft visceral mass and there are gills for respiration.
- The anus and genitals open into the mantle cavity.
- There are two pairs of main nerve cords.
MOLLUSKS (Animation)
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What are 4 characteristics of a mollusk?
- They are mostly found in marine and freshwater. …
- They exhibit organ system level of organization.
- Their body has a cavity.
- The body is divided into head, visceral mass, muscular foot and mantle.
- The head comprises of tentacles and compound eyes.
- The body is covered by a calcareous shell.
Is a clam a mollusk?
Clams belong to a group of invertebrates called mollusks. There are over 100,000 kinds of animals or species in the Mollusca phylum or category. Clams are also known as shellfish. The term shellfish includes members of the mollusk phylum and the crustacean subphylum.
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