A freshwater mussel species reflects a Miocene stream capture between the Mekong Basin and East Asian rivers
Creators
- 1. N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences, Arkhangelsk, Russia
- 2. SSC/IUCN – Mollusc Specialist Group, Cambridge, United Kingdom|N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences, Arkhangelsk, Russia
- 3. N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences, Arkhangelsk, Russia|SSC/IUCN – Mollusc Specialist Group, Cambridge, United Kingdom
- 4. National University of Laos, Vientiane, Lao People's Democratic Republic
- 5. Vietnam Academy of Science and Technology, Ha Noi, Vietnam|Graduate University of Science and Technology, Ha Noi, Vietnam
- 6. National Museum of Natural History, Smithsonian Institution, Washington, DC, United States of America
- 7. SSC/IUCN – Mollusc Specialist Group, Cambridge, United Kingdom|Universidade do Porto, Vairão, Portugal|University of Porto, Matosinhos, Portugal
- 8. North Carolina Museum of Natural Sciences, Raleigh, United States of America
Description
Freshwater mussels belonging to the genus Cristaria Schumacher, 1817 (Bivalvia: Unionidae) are widespread from Mongolia to Indochina while the range of one species, C. plicata (Leach, 1814), covers two biogeographic subregions, i.e., East Asian (Amur River to Vietnam) and Sundaland (Mekong River basin). We present here a taxonomic revision of the nominal taxon Anodonta bellua Morelet, 1866 which was described from the Mekong (Lake Tonle-Sap, Cambodia) but is currently considered a synonym of C. plicata. We obtained molecular data for newly collected Cristaria representatives from the Mekong's tributaries in Laos, which were found as a divergent species-level phylogenetic clade within the genus that is distant from C. plicata. Nevertheless, comparative morphological and morphometric studies did not reveal any significant differences between these two congeners. Our time-calibrated biogeographic modeling reveals that the split between Cristaria bellua (Mekong) and C. clessini (East Asia) probably occurred in the mid-Miocene (15.8 Ma) and may reflect an ancient stream capture between the Mekong Basin and East Asian rivers.
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