Journal
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
Volume 363, Issue 1508, Pages 3401-3412Publisher
ROYAL SOC
DOI: 10.1098/rstb.2008.0110
Keywords
molecular phylogenetics; Diplommatinidae; Mollusca; Pacific; Palau; Micronesia
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Funding
- National Geographic Society Committee for Research and Exploration (NGS CRE) [7972-06]
- American Malacological Society
- Unitas Malacologica
- Conchologists of America
- FMNH Zoology Department Marshall Field Fund
- University of Chicago Hinds Fund
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The endemic diplommatinid land snails (Caenogastropoda: Mollusca) of Belau (Republic of Palau, Micronesia) are an exceptionally diverse group of largely undescribed species distributed among rock and leaf litter habitats on most of Belau's 586 islands. Diplommatinid shell morphology (e. g. shell sculpture) reflects habitat type. In this study, I analysed a subset of the 90 diplommatinid species representing a broad geographical spread of islands in order to reveal the species' phylogenetic relationships and biogeography within the Belau archipelago. Diplommatinid species from the islands of Yap, Pohnpei, Kosrae and Guam are also included in the analysis. One nuclear (28S rRNA) and two mitochondrial (16S rRNA, COI) gene regions comprising 1906 bp were used for phylogenetic reconstruction. Results show that (i) the Belau Diplommatinidae are not monophyletic, as Guam and Yap species should be included as part of the radiation, (ii) Pohnpei and Kosrae species are highly divergent from Belau diplommatinids, (iii) there is little evidence for in situ radiation within individual Belau islands, (iv) spined and heavily calcified rock-dwelling species forma well-supported clade, and (v) Belau diplommatinid genera are in need of revision.
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