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・ Unionist Government 1895–1905
・ Unionist Movement
・ Unionist Movement of the Republic of Moldova
・ Unionist Party
・ Unionist Party (Canada)
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Unionoida
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Unionoida : ウィキペディア英語版
Unionoida

Unionoida is an monophyletic order of freshwater mussels, aquatic bivalve mollusks.〔Bieler R., Carter J.G. & Coan E.V. (2010). ''Classification of Bivalve families''. Pp. 113–133, in: Bouchet P. & Rocroi J.-P. (2010), ''Nomenclator of Bivalve Families''. Malacologia 52(2): 1–184.〕 The order includes most of the larger freshwater mussels, including the freshwater pearl mussels. The most common families are the Unionidae and the Margaritiferidae. All have in common a larval stage that is temporarily parasitic on fish, nacreous shells, high in organic matter, that may crack upon drying out, and siphons too short to permit the animal to live deeply buried in sediment.
==Morphology==
The shells of these mussels are variable in shape, but usually equivalve and elongate. They have solid, nacreous valves with a pearly interior, radial sculpture, and an entire pallial line.〔

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