At Lundy these cup-corals are restricted mostly to the Knoll Pins. It is not clearly understood by marine ecologists why this species has such a small range of distribution around the island. It may be that the juveniles, floating in the water as part of the plankton, only settled out to change into the non-mobile adults at this one site. Sunset cup-corals are a warm water species with the adults usually found in the Mediterranean Sea. It is believed that the larvae ‘hitched’ a ride on a warm water current which runs past the Mediterranean up to the south part of Wales. The first British examples were discovered at Lundy in 1969 and are at the northern-most limits of their distribution.
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