What are the 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..What are the external features of a bivalve?
Bivalve molluscs are completely enclosed by a shell made of two valves hinged at the top.
A hinge ligament made of elastic protein joins the two halves of the shell together, and large adductor muscles between the two valves hold them closed..
What are the main identification of Bivalvia?
Snapshot: Bivalvia
Clade defining feature(s): two hinged shells surrounding a body with large stomach, foot, and filamentous gills; no head or radula..
What are the morphological description of a bivalve?
Bivalves have bilaterally symmetrical and laterally flattened bodies, with a blade-shaped foot, vestigial head and no radula.
At the dorsal or back region of the shell is the hinge point or line, which contain the umbo and beak and the lower, curved margin is the ventral or underside region..
What are the uses of a bivalve?
The shells of bivalves are used in craftwork, and the manufacture of jewellery and buttons.
Bivalves have also been used in the biocontrol of pollution.
Bivalves appear in the fossil record first in the early Cambrian more than 500 million years ago.
The total number of known living species is about 9,200..
What are the uses of bivalve fossils?
They have been used for food, jewelry, decoration, even money.
The first occurrences of Bivalvia are found in Lower Cambrian deposits, but it is not until the Lower Ordovician that bivalve diversification, both taxonomic and ecological, explodes in the fossil record..
What is a Bivalvia in geology?
Bivalves, which belong to the phylum Mollusca and the class Bivalvia, have two hard, usually bowl-shaped, shells (called valves) enclosing the soft body.
The valves are the parts usually found as fossils, but decay of the elastic hinge tissue that joins them means that they are rarely preserved together..
What is the common name for Bivalvia?
Snapshot: Bivalvia
Common names of representatives: clams, scallops, oysters, mussels.
Habitat(s): marine (salt water), freshwater (lakes, rivers, and streams)..
What is the internal system of a bivalvia?
Bivalves have an open circulatory system that bathes the organs in blood (hemolymph).
The heart has three chambers: two auricles receiving blood from the gills, and a single ventricle.
The ventricle is muscular and pumps hemolymph into the aorta, and then to the rest of the body..
What is the structure of a bivalve?
Bivalve molluscs are completely enclosed by a shell made of two valves hinged at the top.
A hinge ligament made of elastic protein joins the two halves of the shell together, and large adductor muscles between the two valves hold them closed..
What three animals belong to the class Bivalvia?
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..
- Bivalves are filter feeders and feed primarily on phytoplankton - microscopic plant life.
In juveniles and adults, the ctenidia, or gills, are well developed and serve the dual purpose of feeding and respiration. - One of the main traits of all bivalves is the absence of a head and its associated organs such as eyes, head tentacles, and mouthparts.
- The life cycles of bivalves include metamorphosis in the majority of cases, involving larval, juvenile, and adult stages.
Across Bivalvia, life cycles are very uniform with differences among species in the length of each stage, and the anatomy and behavior at each stage. - Two of the most prominent features of the bivalve body plan are the lack of a head region and the two half shells connected by a dorsal hinge that surround the body.
The cephalopods have a body plan where the foot is modified into arms, and the visceral mass is located in a more posterior position.
