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Smithsonian National Museum of Natural History
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A side view of a juvenile Carybdea sivickisi jellyfish swimming in the dark of night. Note the central gelatinous tube that spirals at the bottom where the four mouth lips meet (only three lips visible in photo). This tube is called the manubrium, and it serves as the mouth, anus and reproductive channel. Image courtesy: Cheryl (Lewis) Ames.

Fig. 4 - Carybdea sivickisi

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