When fully extended, Diadumene leucolena has a long and slender column, being up to 38 mm (1.5 in) tall and 12 mm (0.5 in) wide. Both column and tentacles are a translucent pale pink or flesh-colour, the column sometimes having a faint green tinge near the top. The column appears to be smooth but close inspection shows irregularly arranged darker swellings. The tentacles closest to either end of the mouth have yellow bases. The closely related species, Diadumene lineata, (previously known as Haliplanella luciae) is a sympatric species of sea anemone living in the same habitats in the same localities. Unlike D. leucolena, it reproduces exclusively by asexual means, resulting in populations consisting almost entirely of cloned individuals. D. lineata has a tendency to thrive for a time, and then unexpectedly disappear from a locality. D. leucolena on the other hand, living in the same localities and conditions, has stable populations. It is hypothesized that sexual reproduction in the latter gives genetic variability and the flexibility to cope with adverse circumstances, while the asexually-breeding D. lineata, with hardly any genetic variability, succumbs when its limits of tolerance are exceeded. Learn more about White Anemone