Majors animal: Anatomy of Metridium (matching)
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| Tentacles | Defense and prey capture
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| Mouth | Ingestion of food and elimination of indigestible particles (egestion)
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| Oral disc | Raised portion of the mouth (equivalent to the hypostome of hydrozoans)
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| Gonads | Organs for sexual reproduction; gametes are released into the gastric pouches and exit the body through the mouth
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| Ostium | Pore that allows circulation of fluids between adjacent body sections
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| Pharynx | Muscular portion of the gastrovascular cavity for pulling prey inward and expelling indigestible particles
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| Retractor muscles | Expand or contract the body
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| Gastrovascular cavity | Specialized chamber for extracellular digestion of prey
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| Primary septum | One of six thin, vertical walls that divides body into sections, providing support and increased surface area for digestion
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| Secondary septum | One of several thin, incomplete vertical walls that further subdivides the body, producing support and increased surface area for digestion
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| Pedal disc | Tough, fleshy base that attaches organisms to rocks or sandy ocean floor; most anemones can use their pedal discs to move slowly, gliding along the ocean floor
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| Acontia | Contain cnidocytes and may be extended through the mouth to aid in subduing live prey or to provide additional defense against predators
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