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tell us that this is a protandrous hermaphrodite; in a chain of individuals the smaller, younger animals at the top of the chain are male and the larger, older one at the base are female.
Eggs are laid, then a pelagic stage before some of the young shelled animals migrate and take up a position on an existing chain as males. Others not locating on a chain settle on stones and become female.
Lat/Lng: 51.7096, -5.168
OS grid ref: SM812059