Marine gastropods are a type of mollusk that live in the ocean. They are characterized by their soft bodies and lack of an external shell. The three most common types of marine gastropods are the Murex, WHELK, and LIMPET. The Murex is a predatory species with a long, spiny shell. The WHELK is a large, spiral-shaped shellfish that feeds on other mollusks. The LIMPET is a small, cone-shaped shellfish that clings to rocks and other surfaces. All three of these species are found in various parts of the world's oceans.