In mollusk, a single or paired sensory attachment to the visceral ganglia is called osphradium. 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.

What is osphradium and its significance?

: 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 the other name for the gills of molluscs What is the function of osphradium?

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.

What are Osphradia present in molluscs?

The osphradium is a pigmented chemosensory epithelium patch in the mantle cavity present in six of the eight extant classes of molluscs (it is absent in the scaphopoda and monoplacophora; among cephalopoda, only the nautilus has what appears to be a set of osphradia), on or adjacent to the ctenidia (gills).

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.

Sense organs in Pila globosa

41 related questions found

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.

What is the function of the mantle in mollusks?

The mantle cavity functions as a respiratory chamber in most mollusks. In bivalves it is usually part of the feeding structure. In some mollusks the mantle cavity is a brood chamber, and in cephalopods and some bivalves such as scallops, it is a locomotory organ.

What is the function of Ctenidium in Pila?

A ctenidium is shaped like a comb or a feather, with a central part from which many filaments or plate-like structures protrude, lined up in a row. It hangs into the mantle cavity and increases the area available for gas exchange.

Which is the larva of Mollusca?

veliger, larva typical of certain mollusks such as marine snails and bivalves and a few freshwater bivalves. The veliger develops from the trochophore (q.v.) larva and has large, ciliated lobes (velum).

Which of these class is phylum Mollusca?

The Phylum Mollusca consist of 8 classes: 1) the Monoplacophora discovered in 1977; 2) the worm-like Aplacophora or solenogasters of the deep sea; 3) the also worm-like Caudofoveata; 4) the Polyplacophora, or chitons; 5) the Pelecypoda or bivalves; 6) the Gastropoda or snails; 7) the Scaphopoda, or tusk shells; and 8) ...

What is gills in molluscs?

A ctenidium is a respiratory organ or gill which is found in many mollusks. ... A ctenidium is shaped like a comb or a feather, with a central part from which many filaments or plate-like structures protrude, lined up in a row. It hangs into the mantle cavity and increases the area available for gas exchange.

What is the respiratory system of Mollusca?

Aquatic molluscs respire through ctenidia. These are the comb-like outgrowths of the mantle and are located within the mantle cavity. Structure: ... ctenidia) or molluscan gill consists of a long flattened axis hangs from the anterior wall of the mantle cavity.

How do molluscs breathe?

Essentially all molluscs inhale by gills that are called ctenidia (comb gills) on account of their brush-like shape. In earthbound molluscs this breath organ is decreased, yet at the same time breath happens in the pallial cavity.

How do molluscs use their radula?

The radula (UK: /ˈrædjʊlə/, US: /ˈrædʒʊlə/; plural radulae or radulas) is an anatomical structure used by mollusks for feeding, sometimes compared to a tongue. It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters the esophagus.

What is Epitaenia?

On the floor of the cavity, near the anterior edge of right nuchal lobe, a prominent ridge extends upto the extreme posterior of the cavity, called the epitaenia. ADVERTISEMENTS: It divides the mantle cavity into two chambers the right branchial chamber and the left pulmonary chamber.

Which of the following is the characteristic feature of Pila globosa?

Habit and habitat- Pila globosa is commonly found in pond, tanks. 1) Pila is soft bodied animal is enclosed in a shell. 2) Shell is spirally coiled round an axis called the collumella and opens outside by the mouth or aperture. 3) Operculum is well developed and close the aperture or the mouth of the shell.

What is the trochophore function?

A trochophore (/ˈtroʊkəˌfɔːr, ˈtrɒ-, -koʊ-/; also spelled trocophore) is a type of free-swimming planktonic marine larva with several bands of cilia. By moving their cilia rapidly, a water eddy is created. In this way they control the direction of their movement.

What are the larval stages of Mollusca?

Three main larval forms are observed in molluscan forms. There are: Trochophore. Veliger.

What kind of larvae do gastropod molluscs have?

The veliger is the characteristic larva of the gastropod, bivalve and scaphopod taxonomic classes. It is produced following either the embryonic or trochophore larval stage of development.

How do molluscs respire and excrete?

Due to their diet, this class of mollusks lacks a radula. Respiration is facilitated by a pair of ctenidia, whereas excretion and osmoregulation are brought about by a pair of nephridia. Bivalves often possess a large mantle cavity.

Why is Pila considered as an amphibious animal?

Respiratory Structures in Pila:

They live most of the time in water but can also thrive well on land. So they are really amphibious in nature and exhibit double mode of respiration i.e., absorb oxygen from water during aquatic respiration and utilize atmospheric air while living on land.

Does Pila have ctenidia?

The ctenidium of Pila, though situated on the right side of the animal, is morphologically the gill of the left side, which has shifted to the right on account of the development of an extensive pulmonary sac on the left side.

What is the mantle of a mollusk quizlet?

- invertebrate with a soft, unsegmented body. - most are protected by a hard outer shell. - has a thin layer of tissue called a mantle that covers its internal organs.

What is the mantle and give its function?

Functions of Mantle

The primary function of a mantle is to enclose and protect the internal organs. The mantle cavity is located inside the mantle, in the mollusk body. It holds water and acts as a respiratory organ.

Where is the mantle located and why is it important in the molluscs?

The mantle is an important part of the body of a mollusk. It forms the outer wall of the mollusk's body. The mantle encloses the mollusk's visceral mass, which is its internal organs, including the heart, stomach, intestines, and gonads.