Does a clam have teeth?
Does a clam have teeth?
Asian Clams have 3 cardinal teeth visible in each valve. The hinge has 2 lateral serrated teeth in each side of the right valve and one on each side of the left valve. Fingernail Clams do not have serrated lateral teeth and only have 1 or 2 cardinal teeth.
What is the purpose of the cardinal and lateral teeth in a clam?
The hinge teeth (consisting of cardinal and lateral teeth) interlock on the two valves preventing slippage. Differences in the nature of the hinge teeth are important in the classification of bivalves. Venus clam Callista erycina showing the hinge ligament that joins the two halves of the shell.
What is the function of the UMBO in clams?
|adductor muscles (noun)||a pair of muscles that close the two valves of a mussel shell. Each muscle extends from the left valve to the right valve, one in the anterior part of the shell and the other in the posterior part.|
|umbo (noun)||the raised portion of the dorsal margin of a shell, also called the beak.|
In which of the following Dentitions in Lamellibranchia true teeth and sockets are absent?
The anodont hinge is characterized by a strong ligament (or a series of transverse ligamental grooves as in the Isognomonidae), however, true teeth are absent in adults as is the case in the pen shells (Pinnidae), tree oysters (Isognomonidae), the pearl oysters (Pteriidae), and some freshwater mussels such as the genus …
Where are a clams eyes?
Giant clams possess several hundred small pinhole eyes (or also known as ‘hyaline organs’) on the exposed mantle (Kawaguti & Mabuchi 1969; Land 2003). These ‘eyes’ are light-sensitive, which allows them to detect changes in light levels, i.e. dark versus light.
Where is the clam’s mantle?
The mantle is all that is visible behind the head: the outer body wall and the fins are all part of the mantle. The brightly coloured mantle of a giant clam protects it from bright sunlight.
Why are clams called bivalves?
Clams and their relatives (oysters, scallops, and mussels) are often called bivalves (or bivalved mollusks) because their shell is composed of two parts called valves. Bivalves have a long history.
What muscles close the clam?
The two valves of the clam are hinged together on one side and open along the other. When closed, two powerful muscles called adductor muscles hold the valves together. Each clam has a mantle or soft membrane layer on the inner surface of the valve.
Why are clams called filter feeders?
Filter Feeding Clams are known as filter feeders because of the way they eat their food. Since they have no heads or biting mouthparts, they have to feed in an unusual way. They pull water — which also contains food particles — in through one of their syphons and into their gills.
What are three examples of bivalves?
Clams, oysters, scallops, and mussels are bivalves. This type of mollusk does not have a radula.
What is the hinge of a clam?
A hinge ligament is a crucial part of the anatomical structure of a bivalve shell, i.e. the shell of a bivalve mollusk. The shell of a bivalve has two valves and these are joined together by the ligament at the dorsal edge of the shell.
Why do scallops have 200 eyes?
So it isn’t widely known that scallops have up to 200 tiny eyes along the edge of the mantle lining their shells. A new study published in Current Biology reveals that scallop eyes have pupils that dilate and contract in response to light, making them far more dynamic than previously believed.
What are the teeth of a desmodont clam?
In the desmodont hinge, also known as an asthenodont hinge, the hinge consists of a large ligamentous resilifer (or chondrophore) which replaces the cardinal teeth, as in the soft-shell clams ( Myidae ).
Where are the hinge teeth of a nut clam?
A close-up photograph of the hinge teeth of a nut clam. Hinge teeth are part of the anatomical structure of the inner surface of a bivalve shell, i.e. the shell of a bivalve mollusk. Bivalves by definition have two valves, which are joined together by a strong and flexible ligament situated on the hinge line at the dorsal edge of the shell.
What kind of teeth do scallops have?
The isodont hinge has lateral tubercles and sockets on either side of a thick ligament which is referred to as a resilium. This arrangement is typical of the oysters ( Ostreidae ), scallops ( Pectinidae ), thorny oysters ( Spondylidae ), and kittens paws ( Plicatulidae ).