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What makes a jellyfish?

Translucent jellyfish, colorful corals and waving sea anemones have very different bodies but all fall on the same big branch in the animal family tree. Jellyfish actually start out anchored to the sea floor, just like corals ...

Scientists search for coral's new home

Coral reefs have long faced problems like overfishing, global warming and pollution—but they're also threatened by how slow they regenerate.

Researchers develop novel microscope to study the underwater world

A new microscopic imaging system is revealing a never-before-seen view of the underwater world. Researchers from Scripps Institution of Oceanography at the University of California San Diego have designed and built a diver-operated ...

Promiscuity may help some corals survive bleaching events

Researchers have shown for the first time that some corals surviving bleaching events can acquire and host new types of algae from their environment, which may make the coral more heat-tolerant and enhance their recovery.

Coral colonies more genetically diverse than assumed

Coral colonies are more genetically diverse than it has been assumed to date. This is the conclusion drawn by biologists at Ruhr-Universität Bochum, who have conducted comprehensive studies into the genetic variability in ...

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Polyp

A polyp in zoology is one of two forms found in the phylum Cnidaria, the other being the medusa. Polyps are approximately cylindrical in shape and elongated at the axis of the body. In solitary polyps, the aboral end is attached to the substrate by means of a disc-like holdfast called the pedal disc, while in colonies of polyps it is connected to other polyps, either directly or indirectly. The oral end contains the mouth, and is surrounded by a circlet of tentacles.

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