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The mantle cavity is a central feature of molluscan biology. This cavity is formed by the mantle skirt, a double fold of mantle which encloses a water space. This space contains the mollusk's gills, anus, osphradium, nephridiopores, and gonopores. The mantle cavity functions as a respiratory chamber in most mollusks. In bivalves it is usually ...
Tresus clams often have a relationship with small commensal pea crabs, often a mating pair, which enter through the large siphon and live within the mantle cavity of the horse clam. [2] The crabs are easily seen and in no way affect the clam as food. The meat is good and makes excellent chowder.
The dorsal part of the body wall is a mantle (or pallium) which secretes calcareous spicules, plates or shells. It overlaps the body with enough spare room to form a mantle cavity. The anus and genitals open into the mantle cavity. There are paired nerve cords. [18] Other characteristics that commonly appear in textbooks have significant ...
Horse clams often have a relationship with small commensal pea crabs of the species Pinnixa faba. These are often a mating pair which enter through the large siphon and live within the mantle cavity of the horse clam. [2] [3] The crabs are easily seen and in no way affect the clam as food. The meat is good and makes excellent chowder.
The bivalve's two siphons are situated at the posterior edge of the mantle cavity. [11] There is an inhalant or incurrent siphon, and an exhalant or excurrent siphon. [12] The water is circulated by the action of the gills. Usually water enters the mantle cavity through the inhalant siphon, moves over the gills, and leaves through the exhalant ...
The mantle of giant clams serves as a habitat for this algae upon which they feed. During daylight, the clams open their shells and extend their mantle tissue. This provides the sunlight needed by ...
Horse clams often have a relationship with small commensal pea crabs, Pinnixa faba, often a mating pair, which enter through the large siphon and live within the mantle cavity of the horse clam. [2] [3] The crabs are easily seen and in no way affect the clam as food. The meat is good and makes excellent chowder.
In some nudibranchs, the mantle cavity and the original gill have disappeared altogether. Instead, the upper surface of the body has numerous club-shaped or branched projections called cerata that function as secondary gills. Secondary gills are also present in the unrelated genus Patella, in which they are found as folds within the mantle cavity.