Question

What is the other name for the gill of a mollusc? What is the function of osphradium?

Answer 1

The osphradium is an olfactory organ in certain molluscs, linked with the respiration organ. ... The organ is present in all members of the genus Conus, the cone snails, a group of predatory sea snails. It is a popular idea among malacologists that the presence of an osphradium should be a molluscan synapomorphy.

Answer 2

Answer:

The other name for the gill of  mollusk is CTENIDIUM.  Osphradium functions as a sensory organ in some mollusks which has chemoreceptors which test the water which in ingested by the animal.

Explanation:

The ctenidium is the organ of aquatic respiration (for breathing under water). It is provided with an afferent blood vessel ( carrying deoxygenated blood ) and an efferent blood vessel ( carrying oxygenated blood ) from the gill to the heart.  

Osphradium is one of the sensory organs in some organisms from phyllum Mollusca. With the help of the chemorecepters present in it, it tests the chemical and physical nature of the water that enters the animal, it also selects the food taken in. The evolution of the osphradium in some mollusks parallels that of ctenidia or gills; the osphradium is lost in those mollusks which have lost the ctenidia or gills.