Classification of bivalve mollusks
What are bivalves classified?
bivalve, (class Bivalvia), any of more than 15,000 species of clams, oysters, mussels, scallops, and other members of the phylum Mollusca characterized by a shell that is divided from front to back into left and right valves.
What are the 4 types of bivalves?
Clams, mussels, oysters, and scallops are members to the class Bivalvia (or Pelecypodia). Bivalves have two shells, connected by a flexible ligament, which encase and shield the soft vulnerable parts of the creature.
What are the 5 groups of bivalves?
They include the clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders. The gills have evolved into ctenidia, specialised organs for feeding and breathing.
What are mollusks classified as?
Mollusks are soft-bodied invertebrates of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.
What is the main characteristic of bivalve molluscs?
Bivalve mollusks (e.g., clams, oysters, mussels, scallops) have an external covering that is a two-part hinged shell that contains a soft-bodied invertebrate.
What are the 4 main classes of mollusks?
Classification
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 two classifications for mollusks?
The major classes of living mollusks include gastropods, bivalves, and cephalopods (Figure below).
- Gastropods. Gastropods include snails and slugs. They use their foot to crawl. …
- Bivalves. Bivalves include clams, scallops, oysters, and mussels. …
- Cephalopods. Cephalopods include the octopus and squid.
What are the 3 classes 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 are characteristics of mollusks?
Molluscs (also know as mollusks) are soft-bodied, bilaterally symmetrical, segmented, coelomate animals; usually shelled having a mantle, ventral foot, anterior head, and a dorsal visceral mass.
What are bivalves give 5 examples?
Oysters, clams, mussels, scallops, cockles, coquinas, and many more are all part of the class Bivalvia. Most soft-bodied, aquatic animals with two shells fall into this group. Bivalves are found in all types of water.
What are examples of bivalves?
Bivalvia/Lower classifications
How many species of bivalves are there?
The second most diverse group of molluscs behind gastropods, bivalves are one of the most important members of most marine and freshwater ecosystems. In fact, there are well over 10,000 described species of bivalve, found from the deepest depths of the oceans, to the streams in your backyard.
What is the common name for bivalve?
Also called lamellibranch. Zoology. any mollusk, as the oyster, clam, scallop, or mussel, of the class Bivalvia, having two shells hinged together, a soft body, and lamellate gills.
What are the 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.
Why is it called a bivalve?
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.
How do you identify bivalves?
The bivalve shell is composed of two valves (“bi-valves”). The valves are joined by a hinge composed of tiny “teeth” and usually also an elastic ligament. The number, size and shape of the teeth as well as the position of the ligament are important characters for the identification of bivalves.
Why are bivalves important?
Bivalves provide direct benefits to modern cultures as food, building materials, and jewelry and provide indirect benefits by stabilizing shorelines and mitigating nutrient pollution.
What are the 7 classes of mollusks?
- Delicate bodied, triploblastic, reciprocally even, and coelomate creatures have a place with the phylum Mollusca.
- Mollusks can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda.