Molluscs are a broad phylum of invertebrate animals having a soft body of bilateral symmetry. they have muscular foot covered by a their bodies protected by a shell or calcium-based exoskeleton except octopuses. All Molluscs are considered aquatic animals, having more than 100,000 species.
they are said to be the second-largest phylum in the animal kingdom after the arthropods.
This is a Complete Guide About Phylum Mollusca Characteristics.
Common name, habitat, classes and more….!
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Mollusca is considered to the second-largest phylum of animals after Arthropoda and are invertebrates. they have foot along with ventricle structure for locomotion. An open circulatory system is present in some molluscs for the blood circulation through vessels and also some have closed circulatory systems to move blood through the body enclosed entirely in blood vessels.
The phylum Mollusca is composed of a variety of organisms. They include slow-moving snails and slugs bivalved (shell with two parts) clams and highly active cephalopods. This phylum has 50,000 living species. It is the second-largest phylum of invertebrates. The giant squid is the largest invertebrate animal.
Molluscs show a great variety of form (structure). But all Molluscs have the same basic structure. They show the following characters:
Mantle is present over the visceral mass. Mantle secretes outer shell. The space between the shell and the mantle cavity contains gills in some Molluscs. A rasping tongue-like structure radula is present in the mouth cavity of many Molluscs. Radula has many horny teeth. The body is highly organized. It has complex digestive, respiratory, circulatory, excretory, nervous and reproductive systems.
Heart pumps the blood into these sinuses. They have blue respiratory pigment called haemocyanin.
The Molluscs are divided into three classes. There following major classes:
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Examples:
Molluscs are indirectly harmful to man. The harmful Molluscs are slugs and shipworms.
Most of the Molluscs are beneficial.
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