Phylum mollusca. Phylum Mollusca

Phylum Mollusca: Characteristics, Examples

Ans: Phylum Mollusca is considered the second largest phylum in the animal kingdom. Typically, at least in the more primitive members of each group, there are one or more pairs of gills called ctenidia which lie in a posterior cavity the pallial cavity or in a posterolateral groove surrounding the foot. Most bivalves are either suspension or deposit feeders that indiscriminately take in particles, but then elaborately sort them based on size and weight, typically assimilating bacteria, protists, and diatoms.

The mollusca

These are soft-bodied animals with an outer covering of calcium shells.

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Bivalves: Phylum Mollusca, Class Bivalvia

A phylogenetic study suggests the Polyplacophora form a clade with a monophyletic Aplacophora.

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Bivalves: Phylum Mollusca, Class Bivalvia

It contains the body organs.

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Phylum Mollusca: Classification, Characteristics, Examples

The shell is secreted by a mantle covering the upper surface. Most bivalves burrow into soft sediment using a well-developed foot, but there are forms that lie either attached or free-living on the bottom of seas and lakes; still others live attached or cemented to rocks and other hard surfaces e.

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Phylum Mollusca

The blood of these molluscs contains the as an -carrier.

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The mollusca

In some groups, however, the shell is absent or greatly reduced, and many shell-less forms are commonly referred to as slugs the shell-less marine nudibranchs are commonly known as sea-slugs. Molluscs have, for centuries, also been the source of important luxury goods, notably , , dye, and. Scroll down to continue reading! In fact, some groups traditionally classified as molluscs may have to be redefined as distinct but related.

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Phylum Mollusca2

They also provide habitat, protection, and food to a wide array of other taxa. These creatures have been important to humans throughout history as a source of food, jewelry, tools, and even pets.

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