Previously, it was unknown how the symbiotic sea anemone Calliactis tricolor reproduced. The present paper reports the discovery of a C. tricolor anemone that was undergoing longitudinal fission. Other anemones were also collected that had the distinctive column scars
characteristic of recently separated anemones. These observations represent the first direct evidence for any type of reproduction by C. tricolor. In addition, small C. tricolor were found at one locality. These small anemones could have been produced sexually.
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