Miscellanea Megadrilogica

@article{Gates1949MiscellaneaM,
  title={Miscellanea Megadrilogica},
  author={Gordon E. Gates},
  journal={The American Naturalist},
  year={1949},
  volume={83},
  pages={139 - 152}
}
Posterior amputation may occur naturally in all post-embryonic stages of the life history of earthworms. Frequency increases with age, sometimes reaching one hundred per cent. After amputation healing may be enteroparietal or cicatricial. In the latter case subsequent developments may be either progressive or regressive. Some species apparently are unable to regenerate posteriorly. 
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