What is Monopectinate gill example?
The organ of aquatic respiration is the ctenidium or gill. On the dorso-lateral wall of the branchial chamber of the mantle cavity, the ctenidium is found. All gill lamellae are not of the same size; they are widest in the middle and increasingly smaller at the two ends. Such a gill is known as monopectinate gill.
What is Bipectinate gill?
In gastropods in many ancient lineages, the gills are bipectinate, having an overall shape that is similar to a bird’s feather, with narrow filaments projecting either side of a central stalk.
What type of ctenidium is Unio?
Unio is a freshwater bivalve mussel that belongs to the phylum Mollusca. As they have aquatic habitat, respiration occurs through gills known as ctenidium. The ctenidium is present in the mantle cavity which also protects it on both sides of the body.
What is ctenidium write its function?
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 ctenidia in molluscs?
A ctenidium is a respiratory organ or gill which is found in many mollusks. This structure exists in bivalves, cephalopods, Polyplacophorans (chitons), and in aquatic gastropods such as freshwater snails and marine snails.
What is the function of ctenidia in Mollusca?
Even though Ctenidia helps in respiration, the organisms which present under the phylum of Mollusca have other specific organs like the mantle cavity and pulmonary sac for sake of respiration. We can say that the function of Ctenidia is to increase the space inside the body and help in respiration.
What is the function of ctenidia in molluscs?
Where are ctenidia located?
How do ctenidia work?
Ctenidial cilia carry water over the gill filaments in a direction opposite to that of the flow of the underlying hemolymph in the ctenidial vessels. This countercurrent phenomenon enhances gas exchange between the hemolymph and water by maximizing the diffusion gradients of O2 and CO2 (Figure 2).
What are the two functions of a gastropods ctenidia?
Molluscs breathe with gills called ctenidia that sit in a cavity between the mantle and body mass (Fig. 3.57). In some molluscs, most notably bivalves like oysters and mussels, the ctenidia are also used as filter feeding apparatus to strain particulate food from the water.
What are the different types of ctenidia present in molluscs?
In Bivalves, a pair of platelike gills and in Cephalopods, 4 gills in Nautilus or 2 gills in Coleoidea (e.g., Sepia, Loligo, Octopus, etc.) are present. Based on the topography, the ctenidia present in molluscs can be divided into following categories: 1. Holobranchiate type 2. Merobranchiate type 3. Plicate type 4. Monopectinate type 5.
What is Neopilina mollusc?
Neopilina is a deep sea mollusc of special interest because it illustrates the primitive occurrence of metamerism in molluscs. Neopilina was discovered in 1952. In Neopilina the single symmetrical shell is low, somewhat patelliform and exogastrically coiled.
What is a Mollusca?
Molluscs, also known as mollusks, are soft-bodied, symmetrical, segmented and coelomate mammals. They are usually shelled with a mantle. Microbiology Notes is an educational niche blog related to microbiology (bacteriology, virology, parasitology, mycology, immunology, molecular biology, biochemistry, etc.) and different branches of biology.
What is monopectinate type ctenidia?
Monopectinate type: This type of ctenidia consists of flattened gill filaments arranged in only single side of the ctenidial axis as observed in Pila, Triton. 5. Bipectinate type: