Anamorphosis (biology)
Encyclopedia
Anamorphosis or Anamorphogenesis refers to metamorphosis
Metamorphosis
Metamorphosis is a biological process by which an animal physically develops after birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation...

 in Arthropoda that results in the addition of abdominal body segments, even after sexual maturity.
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