Ivell's sea anemone

Ivell's sea anemone is a tiny, worm-like anemone up to 20 mm (0.79 in) long and 1.5 mm (0.059 in) diameter; the column is similar to other Edwardsia spp. There are twelve transparent tentacles, arranged in two cycles, nine tentacles in the outer cycle and three in the inner cycle. In life the tentacles of the outer cycle are held flat on the substrate, the three of the inner cycle more or less vertical, often curled over the mouth. Each tentacle has a few transverse bars of pale cream occasionally forming complete rings.

It is endemic to England known from only one site, Widewater Lagoon in West Sussex, the type locality. Searches in recent years have failed to find any specimens and the species is considered extinct by some conservationists.

Burrows in soft mud in saline lagoons or sheltered creeks, it is a tiny species and easily overlooked unless deliberately sought.

Although the type of locality inhabited by this species is not often searched by divers such places are well worth investigating. This species and Nematostella vectensis are probably the only British Anthozoans which can be considered endangered species through habitat destruction and pollution.

Ivell's sea anemone was discovered by Professor Richard Ivell, hence the species' name.[2]