How Molluscas differ from other phyllum describe
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Phylum Mollusca can be distinguished from other invertebrates by the presence of. ... Members of Phylum Mollusca have non-segmented body with a distinct head, muscular foot and visceral hump. A soft and spngy layer of skin forms a mantle over the visceral hump.
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Phylum Mollusca is the predominant phylum in marine environments. It is estimated that 23 percent of all known marine species are mollusks; there are over 75,000 described species, making them the second most diverse phylum of animals. The name “mollusca” signifies a soft body, since the earliest descriptions of mollusks came from observations of unshelled cuttlefish. Mollusks are predominantly a marine group of animals; however, they are known to inhabit freshwater as well as terrestrial habitats. Mollusks display a wide range of morphologies in each class and subclass, but share a few key characteristics, including a muscular foot, a visceral mass containing internal organs, and a mantle that may or may not secrete a shell of calcium carbonate (Figure 1).
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