What is the meaning of osphradium?

Definition of osphradium : a single or paired sense organ connected with one of the visceral ganglia and situated near the gill of most aquatic mollusks that is supposed to be olfactory or to test the purity of the water passing to the gills.

What is osphradium function?

The major function of osphradium is to test the incoming water for silt and food particles. The osphradium also acts as an olfactory organ in certain mollusks and is linked with the respiratory organ. Osphradium structure resembles the feather of a bird and is also called Bipectinate.

What is Pila osphradium?

Osphradium is an olfactory organ present in certain molluscs/Pila. It is linked with the respiration organ. It is a chemoreceptor. It is located near the left nuchal opening. It sense the incoming water for silt and possible food particles.

What is function of osphradium in molluscs?

Osphradium is an olfactory organ which is present in molluscs. This organ acts as a chemoreceptor and is associated with the respiration organ. The primary function of this organ is to analyse the water which is taken inside the body for the presence of silt and food particles.

In which animal osphradium is found?

mollusks. …a chemoreceptive sense organ (the osphradium) monitors the water currents entering the mantle cavity. This organ has regressed in scaphopods, some cephalopods, and some gastropods.

Where is the location of osphradium?

The osphradium is located in the mantle cavity, usually where the water passes to the branchial organs. It is well developed in some gastropod mollusks, in which it apparently serves as an olfactory organ.

Do snails have osphradium?

The osphradium of gastropods is a specialised chemical sense organ, which originally is present twofold in the pallial cavity. Carnivorous snails, such as the common whelk (Buccinum undatum), use their osphradium to find prey.

What period are gastropods from?

Cambrian Period
The earliest undisputed gastropods date from the Late Cambrian Period, around 500 million years ago. Some paleontologists think gastropods are even older, based on a small, shelly fossil called Aldanella, known from Lower Cambrian rocks, but others think Aldanella is a worm.

How do gastropods feed?

Some gastropods are scavengers, feeding on dead plant or animal matter; others are predators; some are herbivores, feeding on algae or plant material; and a few species are external or internal parasites of other invertebrates.

Do gastropods live in water?

Gastropods live both in terrestrial (land) and marine environments, although the vast majority live in the waters of the world. Others may cling to large marine plants, like kelp, and feed off of those. Still, others scavenge along the sea floor for bits of food.

What is the meaning of osphradia in biology?

os·​phra·​di·​um. plural osphradia\\ -​ēə \\. : a single or paired sense organ connected with one of the visceral ganglia and situated near the gill of most aquatic mollusks that is supposed to be alfactory or to test the purity of the water passing to the gills.

What is the function of osphradium in molluscs?

The osphradium is an olfactory organ in certain molluscs, linked with the respiration organ. The main function of this organ is thought to be to test incoming water for silt and possible food particles. It is a popular idea among malacologists that the presence of an osphradium should be a molluscan synapomorphy.

Is the osphradium of Mollusca related to the gill plume?

It will be remembered that, according to Spengel, the osphradium of mollusca is definitely and intimately related to the gill-plume or ctenidium, being always placed near the base of that organ; further, Spengel has shown that the nerve-supply of this olfactory organ is always derived from the visceral loop. Accord ingly, the nerve-supply FIG.

Do monoplacophorans and Scaphopods have osphradiums?

However, an osphradium is absent in monoplacophorans and scaphopods. Moreover, the differences in enervation of these patches suggest that the osphradium (as a patch enervated from the ctenidial nerve) may be different from another organ sometimes called the posterior sensory organ (PSO) with separate enervation from the lateral nerve cords.