Some shellfish or mollusks only have one shell, such as snails. Clams have two shells so they are known as bivalve mollusks. The shells are held together with a hinge. Other bivalves are oysters, cockles, mussels, scallops. Most bivalves bury themselves in sediment, where they are relatively safe from predation.
Which of the following is a bivalve mollusk?
The mollusks that have a hinged, two-part shell joined by strong muscles are called bivalves. Clams, Oysters, and Scallops are bivalve mollusks and are a familiar food source.
What are mollusks that have a hinged shell called?
The mollusks that have a hinged, two-part shell joined by strong muscles are called bivalves. Clams, Oysters, and Scallops are bivalve mollusks and are a familiar food source. These three animals pull their shells closed by contracting powerful muscles near the hinge.
What animals are in the bivalve group?
Bivalves The mollusks that have a hinged, two-part shell joined by strong muscles are called bivalves. Clams, Oysters, and Scallops are bivalve mollusks and are a familiar food source. This group are the the most specialized and complex group. The animals in this group are squid, octopuses, cuttlefish, and chambered nautiluses.
How are mollusks adapted to live in water?
Clams, Oysters, and Scallops are bivalve mollusks and are a familiar food source. These three animals pull their shells closed by contracting powerful muscles near the hinge. The open these shells they have to relax their muscles. These animals are well adapted for living in water.
How are bivalves different from other mollusks?
In all molluscs, the mantle forms a thin membrane that covers the animal's body and extends out from it in flaps or lobes. In bivalves, the mantle lobes secrete the valves, and the mantle crest secretes the whole hinge mechanism consisting of ligament, byssus threads (where present), and teeth.
In what ways does the clam differ from other mollusks?
In what ways does the Clam differ in its characteristics from other typical Molluscs? It lacks a head, radula, and brain. The nervous system is not cephalized. It consists of three pairs of segmented ganglia connected by nerves.
How are bivalves different from other mollusks quizlet?
Bivalves have 2 shells and not all cephalopods have shells. Bivalves are omnivores (eat plants and animals and cephalopods are carnivores. Both of them capture their food but in different ways. The bivalve captures food as water moves over the gills.
How are bivalves different from all other mollusks in regards to their head?
Bivalves are laterally compressed and, unlike most mollusks, there is no head or radula. The internal organs are enclosed by the two mantle lobes that are joined dorsally (Fig. 4C).
What are the characteristics of the three groups of mollusks?
Some of these characteristics are the presence of a shell, the type of shell, the type of foot, the arrangement of teeth in the radula, and the complexity of the nervous system. The three major groups of mollusks are gastropods, bivalves, and cephalopods (SEF ul o pods).
What type of symmetry do clams have?
Bilateral symmetryEach valve of Nuculopsis (right drawing, "Bilateral symmetry (clam)") is nearly a mirror image of the other, so that the plane of symmetry lies along the line at which the valves join, called the line of commissure. This is true of most clams.
How do clams breathe underwater?
To protect themselves clams burrow down in the mud and sand using their foot. They can burrow more than 11 inches! When the tide comes in, they stick their siphons out and inhale fresh seawater to get oxygen so they can breathe.
How does a bivalve breathe?
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.
How does a bivalve breathe quizlet?
Bivalves are adapted to breathe underwater by using gill membranes. In function, gills are like your lungs. They are membranes that take in oxygen and give off carbon dioxide. Water brought in through the incurrent siphon flows to the gills.
What are three characteristics of bivalves?
Three of the main characteristics of bivalves are:Two equally sized shells that close together for protection using muscles.A large, muscular foot that is used to bury within the lake or ocean bottom. ... A straw-like siphon which protrudes out of the shell to take in and get rid of water and food.
Which two structures are missing in bivalves but are present in all other mollusks?
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 characteristics of bivalves?
A bivalve is characterized by possessing two shells secreted by a mantle that extends in a sheet on either side of the body. The oldest part of the shell, the umbo, can be recognized as a large hump on the anterior end of the dorsal side of each shell.
What is the difference between clams and mussels?
Clams have a stronger flavor reminiscent of the sea and are salty or fishy. Mussels have a milder, tender flavor that is somewhat bland, so they tend to be served with a sauce or in a stew.
What's the difference between clams oysters and mussels?
The main difference between clams mussels and oysters is that clams live in fresh or salt water, having hard shells that are smooth and shiny, and mussels live in fresh or salt water, having shells that are oval in shape and elongated at the ends whereas oysters live in salt water, having a more calcified, irregular ...
What is the difference between clams and oysters?
There are differences in the shell textures of oysters and clams. The shell of a clam is smooth and shiny while an oyster has a rough outer shell. Both the organisms take in water through the shells but the filtering procedure is different. Oysters produce pearls which are in much demand but clams do not.
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.
Bivalves
The mollusks that have a hinged, two-part shell joined by strong muscles are called bivalves. Clams, Oysters, and Scallops are bivalve mollusks and are a familiar food source. These three animals pull their shells closed by contracting powerful muscles near the hinge. The open these shells they have to relax their muscles.
Cephalopods
This group are the the most specialized and complex group. The animals in this group are squid, octopuses, cuttlefish, and chambered nautiluses. The word cephalopod means "head-footed" and describes the body structure of the invertebrates. Cuttlefish, like most cephalopods, have a large and well-developed head.
Gastropods
The largest group of the mollusks are called the gastropods includes snails, conchs, abalones, whelks, sea slugs, and garden slugs. Conchs are sometimes called univalves. Every animal in the group has one shell except for slugs because they don't have a shell.
What method do you use to filter feed?
Filter feeding is a kind of aquatic feeding in which the animal consumes a large number of tiny prey pieces at once. Filter feeding, as contrast to predators that seek for specific food items, is just opening your mouth and taking in whatever is available while filtering away the unwanted portions.
Mollusks filter their food in a variety of ways
Bivalve mollusks, like fish, breathe via their gills. Bivalves collect food via their gills as filter feeders. A pointed, retractable “foot” protrudes from the shell of certain bivalves and digs into the surrounding silt, allowing the organism to move or burrow.
Filter feeders may be found in a variety of places
Filter feeding is found primarily among the small- to medium-sized invertebrates but occurs in a few large vertebrates (e.g., flamingos, baleen whales). In bivalves such as the clam, the gills, larger than necessary for respiration, also function to strain suspended material out of the water.
What exactly is a filter feeder?
Filter feeder is defined as an animal (such as a clam or a baleen whale) that feeds by filtering organic materials or minute creatures from a stream of water that passes through some portion of its system.
Filter feeders work by creating a current in the water
Bivalves filter-feed by utilizing their gills to separate organic materials from the water. Cilia, which are tiny filaments that beat to create a current over water over the gills, are used to achieve this. Food is removed by more cilia.
What is the most significant distinction between bivalves and gastropods?
Bivalve shells are made up of two sections that are hinged together. So, if you come across a shell with a hinge, you know it’s a bivalve. Gastropods are made up of one component with a spiral on the end.
Bivalves are eaten by what animals?
Clams are eaten by a variety of animals. People, bears, walruses, raccoons, and sea otters are among the mammals that consume clams.
