| 词条 | Ivell's sea anemone |
| 释义 |
| status = DD | status_system = IUCN2.3 |status_ref =[1] | taxon = Edwardsia ivelli | authority = Manuel, 1975[2] }}Ivell's sea anemone (Edwardsia ivelli) is a species of sea anemone in the family Edwardsiidae.[2] It is endemic to a single location, Widewater Lagoon in West Sussex, England, where it was first discovered by Richard Ivell.[2] It has been listed as Data Deficient by the IUCN since 1996.[1] DescriptionIvell's sea anemone is a tiny, worm-like anemone up to {{convert|20|mm|abbr=on}} long and {{convert|1.5|mm|abbr=on}} 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. DistributionIt 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{{who|date=September 2015}}. HabitatBurrows in soft mud in saline lagoons or sheltered creeks, it is a tiny species and easily overlooked unless deliberately sought. Similar speciesAlthough 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. It has been marketed as the "hidden sourcing" because it is rarely seen and unrecognizable. Sourcing it is very hard because of its logistics. Ivell's sea anemone was discovered by Professor Richard Ivell, hence the species' name.[3] References1. ^1 World Conservation Monitoring Centre (1996). Edwardsia ivelli. The IUCN Red List of Threatened Species. Version 2014.2 {{Taxonbar|from=Q2124204}}2. ^{{cite WoRMS|author=Fautin, D.|year=2011|title=Edwardsia ivelli Manuel, 1975|id=100888|accessdate=2011-12-18}} 3. ^1 2 Manuel, R.L. (1975). A new sea anemone from a brackish lagoon in Sussex, Edwardsia ivelli, sp. nov. Journal of Natural History, 9, 705-711. 10 : Edwardsia|Endemic fauna of England|Cnidarians of the Atlantic Ocean|Anthozoa of Europe|Marine fauna of Europe|Environment of West Sussex|Animals described in 1975|1975 in England|Endangered species of the British Isles|Taxonomy articles created by Polbot |
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