A bivalve shell is part of the body, the exoskeleton or shell, of a bivalve mollusk. In life, the shell of this class of mollusks is composed of two parts, two valves which are hinged together. Bivalves are very common in many kinds of saltwater habitats, but they are also found in brackish water and in freshwater.
Bivalves are a common part of the marine fauna worldwide (scallops, clams, oysters, mussels, etc.). The shells of marine bivalves commonly wash up on beaches (often as separate valves) and the shells of freshwater species can sometimes be found along the flood plains of rivers, and other freshwater habitats.
Bivalves typically have two-part shells, two valves, that are joined by a ligament. The two valves usually articulate with one another using structures known as "teeth" which are situated along the hinge line. In many (but by no means all) bivalve shells, the two valves are symmetrical along the hinge line.
This exoskeleton serves not only for muscle attachment, but also for protection from predators and from mechanical damage. The shell has several layers, and is typically made of calcium carbonate precipitated out into an organic matrix. It is secreted by a part of the molluscan body known as the mantle. A glossary of terms used to describe bivalves is located on a university website here.
Bivalve shells are collected by professional and amateur conchologists, and are sometimes harvested for commercial sale (the international shell trade), occasionally to the detriment of the local ecology.
Shell anatomy, structure and composition
The bivalve shell is composed of two calcareous valves. The mantle, a thin membrane surrounding the body, secretes the shell valves, ligament and hinge teeth. The mantle lobes secrete the valves, and the mantle crest creates the other parts.
The mantle itself is attached to the shell by numerous small mantle retractor muscles, which are arranged in a narrow line along the length of the interior of the shell. The position of this line is often quite clearly visible on the inside of each valve of a bivalve shell, as a shiny line, the pallial line, which runs along a small distance in from the outer edge of each valve, usually joining the anterior adductor muscle scar to the posterior adductor muscle scar. The two adductor muscles are what allow the bivalve to close the shell tightly.
In some bivalves the mantle edges fuse to form siphons, which take in and expel water during suspension feeding. Species which live buried in sediment usually have long siphons, and when the bivalve needs to close its shell, these siphons retract into a pocket-like space in the mantle. This feature of the internal anatomy of a bivalve is clearly indicated on the interior of the shell surface as a pallial sinus, an indentation in the pallial line.
The valves of the shell are made of either calcite (as with, e.g. oysters) or both calcite and aragonite, usually with the aragonite forming an inner layer, as is the case with the Pterioida which have this layer in the form of nacre or mother of pearl. The outermost layer of the shell is known as the periostracum, which is composed of a horny organic substance. This forms a yellowish or brownish "skin" on the outside of the shell. The periostracum may start to peel off of a shell when it is allowed to dry out for long periods.
The shell is added to, and increases in size, in two ways - by increments added to the open edge of the shell, and by a gradual thickening throughout the animal's life.
The two shell valves are held together at the animal's dorsum by the ligament, which is composed of the tensilium and resilium. In life the ligament opens the shell, and the adductor muscle or muscles close the shell.
A few groups of bivalves are active swimmers like the scallops; many bivalves live buried in soft sediments (are infaunal) and can actively move around using their muscular foot; some bivalves such as blue mussels attach themselves to hard substrates using a byssus; other groups of bivalves (such as oysters, thorny oysters, jewel boxes, kitten's paws, jingle shells, etc.) cement their lower valve to a hard substrate (using shell material as cement) and this fixes them permanently in place. In many species of cemented bivalves (for example the jewel boxes), the lower valve is more deeply cupped than the upper valve, which tends to be rather flat. In some groups of cemented bivalves the lower or cemented valve is the left valve, in others it is the right valve.
Near the hinge of the shell is the umbone or beak, a rounded knobbly protuberance. This represents the oldest portion of the shell, extra material later being laid down along the margins on the opposite side of the shell. The hinge area is the dorsum or back of the shell. The lower margin is the ventral side. The anterior or front of the shell is where the byssus and foot are located and the posterior or back of the shell is where the siphons are located. When the umbone is uppermost, the valve with the anterior end to the left is considered to be the left valve while the valve with the anterior end to the right is the right valve.
The age of bivalve molluscs can be estimated in several ways and the Noah's Ark clam Arca noae has been used to compare these methods. The annual growth rings on the exterior of the valves can be counted and give a satisfactory result but sometimes spurts of growth occur which may create an extra ring and cause confusion. Early rings may get worn away near the umbones and the narrow rings near the margin may be difficult to interpret in fully grown individuals. Similar annual pallial line scars on the interior of the valves are more easily seen in dark coloured shells but these may be overgrown and obscured by further deposition of hard material. Another method is examination of the growth lines and bands seen in acetate peel replicas taken in the region of the umbones. The most accurate but most time-consuming method is the microscopic examination of sections through the outer prismatic layer of the shell. Using more than one of these methods should increase the accuracy of the result.
The hinge teeth (dentition) or lack of them is an important feature of bivalve shells. They are generally conservative within major groups, and have historically provided a convenient means upon which to base classification schemes and the phylogenetic order. Some of the various hinge tooth arrangements are as follows:
- Taxodont; rows of similar interlocking teeth on either side of the umbones, as in the arc clams.
- Dysodont; weak teeth near the umbones, as in the marine mussels.
- Isodont; lateral tubercles and sockets on either side of a thick ligament referred to as a resilifer, typical of the oysters and scallops.
- Heterodont; with several wedge-shaped cardinal teeth set within the umbones, may or may not have elongated lateral teeth on either side. This arrangement is characteristic of the venus clams, cockles and several other important groups.
- Asthenodont; cardinal teeth replaced by a large chondrophore or resilifer, as in the soft-shell clams
- Anodont; true teeth absent in adults as in razor clams, and some freshwater mussels such as Anodonta and Anodontites
|Wikimedia Commons has media related to Bivalve shell.|
- "Class Bivalvia". State University of New York College at Cortland. Retrieved 2012-04-11.
- Peharda, Melita; Richardson, Christopher A.; Onofri, Vladimir; Bratos, Ana; Crncevic, Marija (2002). "Age and growth of the bivalve Arca noae L. in the Croatian Adriatic Sea". Journal of Molluscan Studies 68 (4): 307–310. doi:10.1093/mollus/68.4.307.
- Sturm, C. F., T. A. Pearce, and A. Valdes. 2006. The Mollusks: A guide to their Study, Collection, and Preservation. American Malacological Society, Pittsburgh, PA, U.S.A. xii+455 Pp.