Class bivalvia, Biology

Class Bivalvia

Body in a bilohed mantle enclosed in a two-valved shell; head reduced; mouth with labial palps but no radula; foot wedge-shaped; plate-like gills; sexes separate; trochophore and veliger larvae. Class Bivalvia is as well known as Pelecypoda or Lamellibranchia. It includes clams, oysters and muscles. The body of these molluscs is laterally compressed and the shell is made up of two valves hinged dorsally. The shell covers the body completely. The foot of the animal is also laterally compressed. Bivalves have mainly spacious mantle cavity among the molluscs. The large gills that are enclosed in the mantle cavity function like organs of gas exchange and food gathering apparatus producing ciliary currents assisting in filter feeding. Bivalves do not have a distinct head or radula. Most of the bivalves burrow in the bottom of fresh water bodies or sea and the body is properly modified for such a habitat. But there are other forms which have .taken to other modes of life also.

Posted Date: 2/4/2013 1:10:27 AM | Location : United States

Related Discussions:- Class bivalvia, Assignment Help, Ask Question on Class bivalvia, Get Answer, Expert's Help, Class bivalvia Discussions

Write discussion on Class bivalvia
Your posts are moderated
Related Questions
Membrane proteins are classify as either integral (intrinsic) or peripheral (extrinsic) depending on how tightly they are linked with membrane. The Integral membrane proteins are s

Why can the allantois be considered an adaptation to terrestrial life? The allantois is an adaptation to dry land because in embryos of oviparous terrestrial beings, like repti

A 16 year old boy named Jake was admitted into the emergency room complaining of headache, fever, stiffness of abdominal muscles and difficulty swallowing. The doctor on staff bega

Q. What is Atrial Fibrillation ? As the left atrial size increase and atrial wall gets fibrosed, depolarization wave fronts get fragmented and atrial fibrillation sets in. Atri

Determine the term - techniques visualise anatomy Some techniques visualise anatomy, provide objective confirmation of structural abnormality. These include neuroradiological i

site of fertilistion in human

Q. What is the carbon cycle? The carbon cycle represents the recycling and circulation of the chemical element carbon in nature as a result of the action of living beings. T

BASIC PRINCIPLES OF EMERGENCY PSYCHIATRY:   Nurses handling psychiatric  emergencies should keep the following principles in mind:  The initial approach to a clienvpatien

What might be the value of the Everglade restoration plan? Everglades will protect endangered species, such as the Florida panther, and restore the water flow needed by many or

Define some Precautions for Measurement of pH? 1. Never touch the membrane of the glass electrode with anything else except soft tissue paper since it is fragile and is easily