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Amynthas

Genus of annelid worms From Wikipedia, the free encyclopedia

Amynthas
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Amynthas is a genus of earthworms in the family Megascolecidae.[1] They are known as jumping worms, snake worms, or crazy worms because of their erratic thrashing behaviour when disturbed.[2][3][4][5] The genus is native to East Asia, but they are invasive in many areas of the United States.[3][5][6] They are a matter of concern in many states, as they disrupt the native forest ecology by affecting soil structure and chemistry.[3][7]

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Jumping behaviour.
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Appearance

Amynthas species can be differentiated from other earthworms by their clitellum, which is pale, annular, is close to the head, and lies flat against the body.[3][8] They vary in size between 3.8 and 20.3 cm (1.5 and 8.0 in).[8][9]

Life cycle

Amynthas species' faster reproduction rate and their ability to reproduce asexually (parthenogenesis) has contributed to their spread into the United States.[10] The worms reach maturity in 60 days, which allows them to have two hatches per year.[10] Eggs are wrapped in small cocoons, which overwinter while the adults die off at the first freeze each year.[11] The young then emerge the next spring.[12]

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Species

  • Amynthas agrestis (Goto and Hatai, 1899)
  • Amynthas alexandri (Beddard, 1900)
  • Amynthas assimilis (Hong & Kim, 2002)
  • Amynthas borealis (Panha & Bantaowong, 2011)
  • Amynthas comptus (Gates, 1932)
  • Amynthas defecta (Gates, 1930)
  • Amynthas dorualis
  • Amynthas exiguus (Gates, 1930)
  • Amynthas fucosus (Gates, 1933)
  • Amynthas gracilis (Kinberg, 1867)
  • Amynthas hilgendorfi (Michaelsen, 1892)
  • Amynthas hupbonensis (Stephenson, 1931)
  • Amynthas japonicus (Horst, 1883)
  • Amynthas kinmenensis
  • Amynthas longicauliculatus (Gates, 1931)
  • Amynthas luridus (Shen, Chang, & Chih, 2019)[13]
  • Amynthas mekongianus (Cognetti, 1922)
  • Amynthas minimus
  • Amynthas mirifius
  • Amynthas moakensis
  • Amynthas morrisi (Beddard, 1892)
  • Amynthas mujuensis
  • Amynthas obsoletus
  • Amynthas papulosus (Rosa, 1896)
  • Amynthas phatubensis (Panha & Bantaowong, 2011)
  • Amynthas polyglandularis
  • Amynthas pulvinus
  • Amynthas ruiyenensis (Shen, Chang, & Chih, 2019)[13]
  • Amynthas sangumburi
  • Amynthas siam (Blakemore, 2011)
  • Amynthas srinan (Panha & Bantaowong, 2011)
  • Amynthas taiwumontis
  • Amynthas tessellatus
  • Amynthas tokioensis (Beddard, 1892)[13]
  • Amynthas tontong (Panha & Bantaowong, 2011)
  • Amynthas wuhumontis
  • Amynthas wujhouensis

References

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