Marine Biology

, Volume 158, Issue 6, pp 1259–1269 | Cite as

Sympatry and allopatry in the deeply divergent mitochondrial DNA clades of the estuarine pulmonate gastropod genus Phallomedusa (Mollusca, Gastropoda)

  • Rosemary E. GoldingEmail author
  • Donald J. Colgan
  • Guy Nelmes
  • Tina Reutelshöfer
Original Paper


DNA sequences of the mitochondrial cytochrome c oxidase subunit I (COI) gene were collected from estuarine snails in the genus Phallomedusa to examine the effects of estuarine isolation on population structure and gene flow. Three clades were recovered, one corresponding to Phallomedusa austrina and two others with the morphology of Phallomedusa solida. The haplotype diversity in all three clades indicated recent population expansion. Phallomedusa austrina was restricted to the west of a previous land bridge in the Bass Strait between mainland Australia and Tasmania, and P. solida to its east and to northern Tasmania. Phylogeographic analysis of P. austrina and P. solida shows strong geographic separation of species, but no local genetic structure indicative of regional or estuarine isolation. The clades of P. solida exhibit substantial genetic divergence and were sympatric across their entire distribution in eastern Tasmania and mainland Australia. Such a situation, which has not previously been observed in phylogeographic studies of southeast Australia, suggests that P. solida has had a complex refugial history during periods of environmental challenge.


Internal Transcribe Spacer Mangrove Forest Haplotype Network Larval Shell Posterior Probability Support 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



Funding for this project was provided by the Australian Museum and the James N. Kirby Foundation. REG was supported by a Chadwick Biodiversity Fellowship from the Australian Museum. Assistance from the Australian Museum DNA laboratory and malacology collections staff is gratefully acknowledged. Two anonymous reviewers are thanked for their comments.


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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Rosemary E. Golding
    • 2
    • 1
    Email author
  • Donald J. Colgan
    • 1
  • Guy Nelmes
    • 1
  • Tina Reutelshöfer
    • 1
  1. 1.Australian MuseumSydneyAustralia
  2. 2.Field Museum of Natural HistoryChicagoUSA

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