Which class of Mollusks includes snails, slugs, or nudibranches? 0. While there may be variations in other parts, such as having a shell or sensory appendages, all mollusks have some form of mantle, visceral mass, and foot. Jennifer Kennedy, M.S., is an environmental educator specializing in marine life. The large, muscular organ mollusks use for locomotion and prey capture. The sorting process is by no means perfect. Troncoso, J.S., Trigo, J.E. [71] Even so, bivalves remain abundant and diverse. The mollusk then secretes layers of aragonite and conchiolin to wall off this irritation and a pearl is formed. Which body structure of a mollusk contains the internal organs? [15]:367403 The pearl industry is so important in some areas, significant sums of money are spent on monitoring the health of farmed molluscs. Chances are, you've encountered plenty of members of the phylum Mollusca in your lifetime, but perhaps never realized they were designated as mollusks. Cnidarians Reproduction: Sexual & Asexual | How Do Cnidarians Reproduce? The coelomic cavity is reduced. How Pearls Form and Which Species Makes Them, Cephalopod Class: Species, Habitats, and Diets, M.S., Resource Administration and Management, University of New Hampshire, B.S., Natural Resources, Cornell University. lessons in math, English, science, history, and more. In 1969 David Nicol estimated the probable total number of living mollusc species at 107,000 of which were about 12,000fresh-water gastropods and 35,000terrestrial. The cavity was at the rear in the earliest molluscs, but its position now varies from group to group. [37], Most molluscs are herbivorous, grazing on algae or filter feeders. The anus, in the part of the mantle cavity, is swept by the outgoing "lane" of the current created by the gills. Shelled molluscs therefore predate the earliest trilobites. The basic body plan shown here varies among mollusk classes. What body part encloses the excretory organs the heart and part of the intestines of a mollusc? Mollusks are a very diverse phylum. All mollusk wastes - both digested and undigested - are eventually excreted from the body by an anal structure that allows the waste to pass through the mantle and out of the body entirely.
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