Bivalve Anatomy
Within the shell is a fleshy layer of tissue called the mantle; there is a cavity (the mantle cavity) between the mantle and the body wall proper.
Bivalves are marine and freshwater molluscs belonging to the class Bivalvia. Other names for the class include Acephala, Bivalva, Pelecypoda, and Lamellibranchia.
Bivalve: in this group of aquatic molluscs the soft parts are encased in a shell consisting of two parts known as 'valves'.
Larvae: stage in an animal's lifecycle after it hatches from the egg.
Bivalve mollusks, crustaceans, and smaller fish
INCUBATION:
Spawning primarily occurs from late fall to early spring ...
Bivalves, shrimp, crabs, annelids, octopus, whelks, and small fish
GESTATION:
Species exhibits dioecism. Fertilization is internal. Species is internal live bearer.
BIVALVES
Clam Life Cycle - Received from Kenny in New York.
Q: Could you describe the life cycle of a clam from fertilization to adult stage? How does a clam's nervous system help it respond to changes in its environment?
Bivalves are among the more diverse groups of molluscs with 9200 species alive today. Bivalves are notable for their two, mirror-image shell halves (also called valves). Bivalves include clams, oysters, mussels and scallops.
Foot: Like most bivalves, mussels have a large organ referred to as a foot, which is tongue-like in shape with a groove on the ventral surface, which is continuous with the byssus pit.
Bivalve Pulvinitidae
Black and White Snapper, Macolor niger (Forsskål, 1775)
Black and White Tree Kangaroo specimen
Black Dragonfish, Idiacanthus atlanticus Brauer, 1906
Black Field Cricket
Black Flying-fox
Black Flying-fox ...
An example of the latter is seen in a common little freshwater bivalve, the Pisidium pusillum, which has been studied by Lankester. The gastrula is formed in this case by invagination.
When an American oystercatcher pries an oyster shell open, it quickly clips the bivalve's adductor muscle (the muscle that holds its shell shut). The bivalve cannot protect itself by closing its shell and is eaten by its predator.
LESSON, I paid all imaginable attention to them, always aided with an excellent glass, in order to find whether or not they fed on bivalve shell-fish found in the shallows of sand-bars and other places at low water; ...
Cephalopods are mollusks and therefore are related to bivalves (scallops, oysters, clams), gastropods (snails and slugs), scaphopoda (tusk shells), and polyplacophorans (chitons).
They hover above the sea floor, searching for worms, bivalves, pelagic copepods, and other crustaceans for food. The Dumbo octopus is strange in the way it consumes food in that it swallows its prey whole, which differs from any other kind of octopus.
Introduced Asian clam is primary bivalve taken (Marion et al. 1991). Benthic insects, crayfish, and an occasional dead fish also consumed. Juveniles eat small snails, but apparently rely more on insects than adults (Tinkle 1958).
Crabs, crayfish and bivalve molluscs (two-shelled molluscs such as cockles) are preferred, although it will eat almost anything it can catch.
The Common Octopus is an active nocturnal predator that feeds mainly on crustaceans, fish and bivalves. They leave their dens at dusk to go for hunting trips, and return at dawn.
The soft subrostral fins are used to probe the substrate in search of bivalve prey and may serve to detect water expelled from a clam's siphon or the weak bioelectric field generated by a bivalve.
Although it is possible for food oysters to produce pearls, they should not be confused with actual pearl oysters, which are from a different family of bivalves.
Two theories on how walruses eat bivalves have been proposed, and it appears that walruses employ both methods. Walruses crack mollusk shells between their flippers and then eat the soft part.
They open bivalve shellfish by stabbing between the shells and twisting the bill to part the shells or by hammering a hole in the shell. The adults spend some time teaching their offspring the trick of opening shells, a constant source of amusement.
Adult blue crabs feed on bivalves, crustaceans, fish, worms, plants, detritus, and nearly anything else they can find, including dead fish and plants.
Feeding Habits: 100% of stomachs that were examined contained detritus, and most also contained algae, sand, small freshwater bivalves, water fleas, and decaying matter; ...
Prey
The giant octopus usually feeds on bivalves, crabs, and lobster, but will eat a range of species. They have also been observed eating fish, sharks, and even birds.
Habit: Gregarious, living mainly in herds. Diet: Mainly bivalve mollusks, but also other invertebrate marine animals, fish and sometimes seals. Lifespan: Up to 40 years.
Related Species ...
Diet The American oystercatcher uses its long bill to pry open mussels, oysters and other bivalves. It also eats barnacles, starfish, crabs and jellyfish. It forages in shallow water by sticking its bill in the mud and probing for food.
Diet: Primarily feeds on mollusks, especially mussels and other bivalves. Will also eat crustaceans, marine worms, aquatic insects, and small fish. Occasionally feeds on plant material.
Oystercatchers feed on bivalves, worms and insect larvae but rarely, if ever, on fish.
These smart birds will crack the shells of clams, mussels, and other bivalve mollusks by picking them up, flying with them to a height, and then dropping them to rocks below.
By contrast, a platypus finds most of its food underwater, using its sensitive snout to hunt. Its prey may include insects and their larvae, bivalves, gastropods, freshwater crustaceans, and the like.
The oyster is a sessile (immobile) mollusc that is commonly found clinging onto shipwrecks, debris and harbour walls around the world. Oysters are bivalve molluscs meaning that they are closely related to other animals such as scallops, ...
Food
: They consume mostly crustaceans and molluscs, and apparently favour crab and shrimp. Bivalves, snails, fish, and other octopus are also eaten.
This ray feeds mainly on bivalve mollusks, crushing them and neatly separating the meat from the shells, probably with the aid of a series of papillae in the back of the mouth. Very few shell fragments are found in its stomach.
conch " The external ear of a mammal; sometimes the spelling is concha (plural conchae); the origin of both spellings is conch or konch, originally a bivalve shell of a marine mollusk.
cursorial " Adapted or modified for running, such as are deer.
Young eat earthworms, slugs and snails, while adults dine on berries, fruit, fungi (can eat varieties poisonous to humans), insects, crayfish and bivalves.
Life Span:
Average is 50 years; record is 140 years.
- Preparation of specimens to be added to the collection; attaching labels, printing labels, and shelving and organizing the freshwater bivalve collection.
Sucking Face: The walrus' mouth acts like a vacuum. By drawing its tongue rapidly into its mouth, like a piston, the walrus creates the suction needed to draw clams and other bivalves out of their shells.
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Echiodon and Snyderidia - Free-living
Carapus and Onuxodon - Commensal
Encheliophis - Parasitic: Fish in this group live in invertebrate hosts found in shallow-water coral communities such as bivalves, sea cucumbers, and starfish.
Species ...
mollusk
Mollusks are marine invertebrates with a soft, unsegmented body. Many have a calcerous shell around the body. Mollusks include squid, octopus, chitons, snails, and bivalves (like clams).
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American Oystercatchers are found in coastal areas, most commonly along the central Gulf. They forage along the shore and on sandbars and mudflats. They pry open partially open shellfish and hammer on closed bivalves until they break open.
The green sea turtle is primarily an herbivorous species, with adults consuming marine vegetation and macroalgae. However, juveniles are more omnivorous, consuming sponges, jellyfish, worms, snails and bivalves.
Bill looks to fat to pry open a shell, but its "laterally compressed", so it is really rather thin if you could see it from the front, so it can enter a bivalve's shell and sever the muscle. Neat trick. Boring details below.
Last updated 3/17/96 An uncommon to rare permanent resident on the UTC coast. Gull sized its most distinguishing feature is its large bright red/orange bill. The bill seen on end is very thin and is used to pry open oysters and other bivalves.
The bill can also function more like a hammer, useful for pummeling sealed shellfish until they break apart. While bivalves such as oysters or clams are its main food source, the American Oystercatcher feeds opportunistically on prey such as shrimp, ...
Most birds return north in March and April, however some individuals may stay over winter in Australia.
Forages for food by methodically thrusting its bill deep into the mud to search for invertebrates, such as bivalve molluscs, gastropods, ...
 See also: Clam, Shark, Whale, Giant Clam, Crocodile
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