The 2019 Mussels of the Month.
December 2019
 Parvasolenaia rivularis (Unionidae, East Asia)
The December 2019 Mussel of the Month is Parvasolenaia rivularis. Parvasolenaia is a genus of three species found in East Asia.
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November 2019
 Yaukthwa peguensis (Unionidae, East Asia)
The November 2019 Mussel of the Month is Yaukthwa peguensis. Yaukthwa is a genus of eight species found in Myanmar and Thailand.
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October 2019
 Obovalis omiensis (Unionidae, East Asia)
The October 2019 Mussel of the Month is Obovalis omiensis. Obovalis is a monotypic genus from Japan.
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September 2019
 Sagittunio nasutus (Unionidae, North America)
The September 2019 Mussel of the Month is Sagittunio nasutus. Sagittunio is a genus of four species found in eastern North America.
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August 2019
 Elongaria orientalis (Unionidae, East Asia)
The August 2019 Mussel of the Month is Elongaria orientalis. Elongaria is a genus of two species from Java and Borneo.
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July 2019
 Pseudunio homsensis (Margaritiferidae, North Eurasia)
The July 2019 Mussel of the Month is Pseudunio homsensis. Pseudunio is a genus of three species from Mediterranean Europe and northern Africa.
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June 2019
 Cambarunio iris (Unionidae, Nearctic)
The June 2019 Mussel of the Month is Cambarunio iris. Cambarunio is a genus of seven species and widely distributed in eastern North America.
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May 2019
 Pletholophus tenuis (Unionidae, Indotropical)
The May 2019 Mussel of the Month is Pletholophus tenuis. Pletholophus is a monotypic genus widespread in southeastern Asia.
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April 2019
 Pachynaias spheniopsis (Unionidae, Neotropical)
The April 2019 Mussel of the Month is Pachynaias spheniopsis. Pachynaias is a genus of only two species endemic to Central America.
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March 2019
 Utterbackia peggyae (Unionidae, Nearctic)
The March 2019 Mussel of the Month is Utterbackia peggyae. Utterbackia is a genus of three species from eastern North America.
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February 2019
 Monodontina vondembuschiana (Unionidae, Indotropical)
The February 2019 Mussel of the Month is Monodontina vondembuschiana. Monodontina is a genus of four species from southeastern Asia, from Indochina to the Sunda Islands.
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January 2019
 Gibbosula rochechouartii (Margaritiferidae, Indotropical)
The January 2019 Mussel of the Month is Gibbosula rochechouartii. Gibbosula is a genus of six species in southeast Asia, from Myanmar to China.
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