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      Indonaiarectangularis (Tapparone-Canefri, 1889), comb. nov., a forgotten freshwater mussel species from Myanmar (Bivalvia, Unionidae)

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          Abstract

          Unio rectangularis Tapparone-Canefri, 1889 is a little-known nominal species of freshwater mussels described from a tributary of the Ayeyarwady River in Myanmar. This taxon was considered a synonym of Gibbosula laosensis (Lea, 1863), a margaritiferid species. However, the range of Gibbosula laosensis does not encompass the Ayeyarwady River watershed. Here we re-examine the holotype of Unio rectangularis and provide a conchological re-description of this species. Based on conchological features such as the shell shape, elevated umbo, and the structure of lateral and pseudocardinal teeth, we transfer this taxon to the genus Indonaia Prashad, 1918 and propose I. rectangularis (Tapparone-Canefri, 1889), comb. nov. It appears to be a rare freshwater mussel species with a restricted range, because it has not been found since the original description. Two additional species in this genus are known from Myanmar, i.e. Indonaia andersoniana (Nevill, 1877) and I. subclathrata (Martens, 1899).

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          The non-marine aquatic Mollusca of Thailand

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            Diversity, biogeography and conservation of freshwater mussels (Bivalvia: Unionida) in East and Southeast Asia

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              Ancient River Inference Explains Exceptional Oriental Freshwater Mussel Radiations

              The concept of long-lived (ancient) lakes has had a great influence on the development of evolutionary biogeography. According to this insight, a number of lakes on Earth have existed for several million years (e.g., Baikal and Tanganyika) and represent unique evolutionary hotspots with multiple intra-basin radiations. In contrast, rivers are usually considered to be variable systems, and the possibility of their long-term existence during geological epochs has never been tested. In this study, we reconstruct the history of freshwater basin interactions across continents based on the multi-locus fossil-calibrated phylogeny of freshwater mussels (Unionidae). These mussels most likely originated in Southeast and East Asia in the Jurassic, with the earliest expansions into North America and Africa (since the mid-Cretaceous) following the colonization of Europe and India (since the Paleocene). We discovered two ancient monophyletic mussel radiations (mean age ~51–55 Ma) within the paleo-Mekong catchment (i.e., the Mekong, Siam, and Malacca Straits paleo-river drainage basins). Our findings reveal that the Mekong may be considered a long-lived river that has existed throughout the entire Cenozoic epoch.
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                Author and article information

                Contributors
                Journal
                Zookeys
                Zookeys
                2
                urn:lsid:arphahub.com:pub:45048d35-bb1d-5ce8-9668-537e44bd4c7e
                urn:lsid:zoobank.org:pub:91BD42D4-90F1-4B45-9350-EEF175B1727A
                ZooKeys
                Pensoft Publishers
                1313-2989
                1313-2970
                2019
                05 June 2019
                : 852
                : 23-30
                Affiliations
                [1 ] Northern Arctic Federal University, Northern Dvina Emb. 17, 163002 Arkhangelsk, Russian Federation Northern Arctic Federal University Arkhangelsk Russia
                [2 ] Federal Center for Integrated Arctic Research, Russian Academy of Sciences, Northern Dvina Emb. 23, 163000 Arkhangelsk, Russian Federation Federal Center for Integrated Arctic Research, Russian Academy of Sciences Arkhangelsk Russia
                [3 ] CIBIO/InBIO – Research Center in Biodiversity and Genetic Resources, University of Porto, Campus Agrário de Vairão, Rua Padre Armando Quintas 7, 4485-661 Vairão, Portugal University of Porto Porto Portugal
                [4 ] CIIMAR/CIMAR – Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos, S/N, 4450-208 Matosinhos, Portugal International Union for Conservation of Nature Cambridge United Kingdom
                [5 ] SSC/IUCN – Mollusc Specialist Group, Species Survival Commission, International Union for Conservation of Nature, c/o The David Attenborough Building, Pembroke Street, CB2 3QZ Cambridge, UK Fauna & Flora International – Myanmar Program Yangon Myanmar
                [6 ] Fauna & Flora International – Myanmar Program, Yangon, Myanmar Fauna & Flora International – Myanmar Program Yangon Myanmar
                [7 ] North Carolina State Museum of Natural Sciences, 11 West Jones St., Raleigh, NC 27601, USA North Carolina State Museum of Natural Sciences Raleigh United States of America
                Author notes
                Corresponding author: Ivan N. Bolotov ( inepras@ 123456yandex.ru )

                Academic editor: Y. Mutafchiev

                Article
                33898 urn:lsid:arphahub.com:pub:f62e0c88-ce81-5851-a2f3-1ce44e9e02d9 urn:lsid:zoobank.org:pub:48C1EFF9-105F-4D2C-A801-A61D320F3B26
                10.3897/zookeys.852.33898
                6562052
                31210740
                816ffa38-aebe-4efe-ad52-49cd549fbc2e

                This is an open access article distributed under the terms of the CC0 Public Domain Dedication.

                Categories
                Short Communication
                Bivalvia
                Unionidae
                Freshwater
                Nomenclature
                Taxonomy
                Myanmar

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