Compare bivalve gills with the gills of other molluscs. They use their foot for burrowing. In filibranchs and lamellibranchs, the ctenida trap the food particles in their mucous coating and transfer the food to the labial palps via ciliary action. Derived from primitive ctenidia by a great lengthening of filaments along each side of the central mass. Most species of bivalves are filter feeders. The Gill Function In Gas Exchange, Whereas The Osphradium Is A Chemosencorx Organ. Most bivalves have this type of gill and are called lamellibranchs. BivalvesClams and relatives (Class: Bivalvia) Bivalves have two shells (valves) held closed by powerful muscles. In different bivalve groups the gill construction can be so different, that the gill construction type is a major part of bivalve systematics. Gills of bivalve molluscs function in both respiratory and feeding roles. The gills not only serve for respiration, but also for feeding the mussel. The Osphradium Functions In Gas Exchange, Whereas The Gill Is A Chemosensory Organ C. The Gill Takes Up 02 From Seawater, Whereas The Osphradium Releases CO2 Into It. Include a description of protobranch and lamellibranch gills along with a discussion of morphology, primary, and secondary functions. The shell is produced by the underlying mantle; it grows along the outer margins. This flow of water also functions in respiration, allowing organisms to obtain fresh oxygen. D. They use their foot for burrowing. Cilia are present on the gill filaments in the lateral, laterofrontal and frontal cells and each type have specific arrangements and functions. Bivalves have just a single pair of gills (*ctenidia*). The shell is produced by the underlying mantle; it grows along the outer margins. Bivalves have two shells (valves) held closed by powerful muscles. A. However, these are large and fold back on themselves providing a highly efficient surface for filter feeding. A few bivalve species are predatory, including some deep-sea scallops. Aquatic gastropods have gills located in the mantle cavity. The gills of bivalve molluscs function in both a respiratory and a feeding role. Gills of almost all bivalves are the site of gas exchange during respiration. The gills consist of a series of filaments which may be modified and grouped into W-shaped tubes with the ascending and descending limbs aligned to form sheets or lamellae (an aligned column of Ws forming four such sheets). B. The mantle (the sheet-like organ that produces the shell) is large and often fused at the edges to form inhalent and exhalent siphons . Currents of water are drawn into the body and through the gills, where tiny food particles are caught in the gill mucus. The mantle of terrestrial gastropods functions as a lung. posterior end. What Is The Functional Difference Between The Bivalve Gill And Ospharadium? The four main feeding types of bivalves are defined by gill structure. In protobranchs, the ctenida are used only for respiration and food is caught by the labial palps. Mussels use their foot for the production of threads for attachment. The gills are large because they are used for filter-feeding as well as respiration. Gills of most bivalves function in both respiration and feeding. Cilia are present on gill filaments in lateral, latero-frontal and frontal cells and each type has specific arrangements and functions. Mussels breathe exclusively with gills.

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