| 词条 | Amynthas mekongianus |
| 释义 |
| status = | status_system = | status_ref = | image = | image_width = | taxon = Amynthas mekongianus | authority = (Cognetti, 1922) | synonyms = Megascolex mekongianus }}Amynthas mekongianus, the Mekong worm or Mekong giant earthworm, previously known as Megascolex mekongianus, is a species of earthworm in the family Megascolecidae. It is native to the vicinity of the River Mekong in southeastern Asia and may have more than 500 segments and grow to a length of {{convert|2.9|m|ft|0|abbr=on}}.[1] DescriptionThe Mekong giant earthworm may grow to a length of up to {{convert|2.9|m|ft|0|abbr=on}}.[2] Compared to their great length, these worms are relatively slender.[1] The type specimen was one metre long and {{convert|8|mm|in|1|abbr=on}} wide at the broadest point (segment 5). It had 370 segments and was a greyish colour, rather paler on the ventral surface. The prostomium was poorly preserved. The second segment had 46 setae (bristles) in an incomplete ring with a gap on the ventral surface. Segments 3 to 25 bore about 100 setae each, arranged in a complete ring. The male pores were on segment 17, but this specimen was immature and lacked a clitellum.[2] Distribution and habitatThe type specimen was recorded as being from "Ban Leum on Mekong River, Annam". This was mistakenly believed to refer to a village in Central Vietnam well away from the River Mekong, but it has been found that "Ban leum" means "[I] forget the place" in the local dialect, and the type locality is thought to be in Thailand or Laos. The river forms a delta at that point and contains extensive mud and sand flats and embankments where the worms live. Pigs forage and fishermen dig worms for bait there.[2] EcologyUnlike most other species of giant earthworm, which generally inhabit pastureland, the Mekong worm burrows into the muddy banks of the River Mekong in Laos.[3] The worm forms complex networks of tunnels and brings large quantities of ingested soil to the surface in the form of worm castings.[4] The worms may be collected from the mud, but are more easily collected from underwater at depths around {{convert|40|cm|in|0|abbr=on}}. Little is known of the worm's ecology.[2] References1. ^{{cite web |url=http://www.bio.net/bionet/mm/annelida/2005-April/002375.html |title=Terrestrial earthworms: body size range |author=Blakemore, R.J.|accessdate=28 October 2017}} {{Taxonbar|from=Q48838660}}2. ^1 2 3 {{cite journal |author=Blakemore, Robert J. |author2=Csuzdi, Csaba |author3=Ito, M.T. |author4=Kaneko, N. |author5=Paoletti, M.G. |author6=Spiridonov, S.E. |author7=Uchida, T. |author8=Van Praahg, B.D.|year=2007 |title=Megascolex (Promegascolex) mekongianus Cognetti, 1922 – its extent, ecology and allocation to Amynthas (Clitellata/Oligochaeta: Megascolecidae) |journal=Opuscula Zoologica |location=Budapest |volume=36 |pages=19–30 |url=https://www.researchgate.net/publication/26530383 }} 3. ^1 {{cite book|author1=Grime, J. Philip|author2=Pierce, Simon|title=The Evolutionary Strategies that Shape Ecosystems |url=https://books.google.com/books?id=kDnGU-elg3kC&pg=PT121 |year=2012 |publisher=John Wiley & Sons |isbn=978-1-118-22327-7 |page=121}} 4. ^{{cite book|author=Ritz, Karl|title=The Architecture and Biology of Soils: Life in Inner Space |url=https://books.google.com/books?id=nprYFYp2uPAC&pg=PA72 |year=2011 |publisher=CABI |isbn=978-1-84593-533-7 |page=72}} 3 : Megascolecidae|Animals described in 1922|Fauna of Laos |
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