Gastropods are one of the main divisions of phylum Mollusca and include organisms that bear a coiled [Fig. 9.1(1)] or uncoiled (Vermiform or worm-like; [Fig. 9.1(2)] calcareous shell; few others, such as slugs, have no hard parts. Gastropods, originally, were exclusively marine but during Mesozoic and Cenozoic times, became adapted for life in fresh waters, and finally also enabled them to invade dry land. However, a large majority of the group still maintained existence in the sea. Taken together, recent and fossil species of gastropods considerably outnumber all other species of mollusks combined.
KeywordsGrowth Line Anterior Extremity Mantle Cavity Gastropod Shell Spiral Angle
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