Progenetic species in polychaetes (Annelida) and problems assessing their phylogenetic affiliation.

  title={Progenetic species in polychaetes (Annelida) and problems assessing their phylogenetic affiliation.},
  author={Torsten Hugo Struck},
  journal={Integrative and comparative biology},
  volume={46 4},
Progenesis is defined as the retention of ancestral juvenile characters by adult stages of descendants due to an acceleration of the sexual maturation and thus is often regarded as a fast evolutionary process. Several small, meiofaunal polychaetes, such as Dinophilidae, some "Dorvilleidae" (for example, Parapodrilus), and Protodrilida, exhibit morphological simplicity in that they lack features typical of larger polychaetes, for example, parapodia and/or head appendages. Due to the general… CONTINUE READING
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