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Large-scale species delimitation method for hyperdiverse groups.

N Puillandre1, M V Modica, Y Zhang

  • 1'Systématique, Adaptation et Evolution', UMR 7138 UPMC-IRD-MNHN-CNRS-UR IRD 148, Muséum National d'Histoire Naturelle, Département Systématique et Evolution, CP 26, 57 Rue Cuvier, F-75231 Paris Cedex 05, France. puillandre@mnhn.fr

Molecular Ecology
|April 13, 2012
PubMed
Summary
This summary is machine-generated.

Accelerating biodiversity description is crucial. An integrative taxonomy approach, combining DNA, morphology, and distribution data, successfully identified 87 species in the hyperdiverse Turridae family, more than doubling known species. This method offers a reproducible protocol for large-scale species delimitation.

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Area of Science:

  • * Marine Biology
  • * Taxonomy
  • * Molecular Ecology

Background:

  • * Rapid biodiversity loss necessitates accelerated species description.
  • * Traditional molluscan taxonomy relies heavily on shell morphology, which is challenging in hyperdiverse groups like Turridae due to homoplasy and plasticity.
  • * Existing methods struggle to keep pace with discovery needs, particularly for deep-sea or cryptic species.

Purpose of the Study:

  • * To develop and apply an integrative taxonomy approach for robust species delimitation in the hyperdiverse South-West Pacific Turridae family.
  • * To significantly increase the number of described species within the Gemmula genus.
  • * To establish a formalized, reproducible protocol for large-scale species delimitation in poorly understood molluscan groups.

Main Methods:

  • * Utilized a four-pronged integrative approach combining DNA Barcode (COI gene) analysis with species delimitation tools (General Mixed Yule Coalescence Method and Automatic Barcode Gap Discovery).
  • * Visualized species hypotheses using Klee diagrams and validated them with nuclear gene (rRNA 28S) data, morphological characters, and geographical/bathymetrical distribution.
  • * Applied the protocol to a dataset of 1000 Turridae specimens from the South-West Pacific.

Main Results:

  • * Identified 87 distinct Turridae species, more than doubling the previously known species count for the Gemmula genus.
  • * The integrative approach proposed 27 novel species hypotheses not currently recognized in the literature.
  • * Demonstrated the limitations of a purely morphology-based approach, which identified only 13 new species for Gemmula over 30 years.

Conclusions:

  • * The applied integrative taxonomy strategy provides a highly effective and reproducible protocol for the large-scale delimitation of species in hyperdiverse marine gastropod groups.
  • * This multidisciplinary approach significantly enhances the accuracy and efficiency of species discovery compared to traditional methods.
  • * The findings underscore the importance of combining molecular, morphological, and ecological data for comprehensive biodiversity assessment in the face of increasing extinction rates.