Anamorphosis (biology)

Anamorphosis or Anamorphogenesis refers to postembryonic development and moulting in Arthropoda that results in the addition of abdominal body segments, even after sexual maturity. An example of this occurs in proturans and millipedes.

Anamorphic development in a generalized millipede that reaches maturity in stage V

Protura hatch with only 8 abdominal segments and add the remaining 3 in subsequent moults. These new segments arise behind the last abdominal segment, but in front of the telson.

Anamorphosis has been depicted various times throughout early modern literature[1]

In myriapods, euanamorphosis is when the addition of new segments continues during each moult, without there being a fixed number of segments for the adult, teloanamorphosis is when the moulting ceases once the adult has reached a fixed number of segments, and hemianamorphosis is when a fixed number of segments is reached, after which moulting continues with segments only growing in size, not number. [2]

References
  1. Boyle, Jen (2010). Anamorphosis In Early Modern Literature. Farnham, England: Ashgate Publishing Limited.
  2. Fusco, Giuseppe (December 2005). "Trunk segment numbers and sequential segmentation in myriapods". Evolution & Development. 7 (6): 608–617. doi:10.1111/j.1525-142X.2005.05064.x. Retrieved 25 August 2020.


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