What is the second largest animal phylum?

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Molluscs are the second largest animal phylum. Molluscs are terrestrial or aquatic (marine or fresh water) having an organ-system level of organisation. They are bilaterally symmetrical, triploblastic and coelomate animals.Body is covered by a calcareous shell and is unsegmented with a distinct head,muscular foot and visceral hump in Molluscs. The space between the hump and the mantle is called the mantle cavity in which feather like gills are present. They have respiratory and excretory functions. The anterior hea