Unio


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Unio

 

a genus of freshwater bivalve mollusks. The two elongate or oval halves of the shell reach a length of 13.7 cm and are clamped shut by two pairs of short front teeth (one pair on each side) and by three long rear teeth—one on the right and one on the left. The mollusks live in rivers and along the shores of lakes. They feed on organic matter suspended in the water and move along the river or lake bottom by pushing with their wedge-shaped foot. The sexes are separate. The female carries the fertilized eggs, as many as 400,000, in her gills. The eggs develop into glochidia—larvae that parasitize fish. Modern Unio is represented by several species, distributed in Europe, Africa, and Asia. Sources conflict as to the number of species in the USSR. Estimates range from two to seven species. The largest and thickest shells are used for making mother-of-pearl buttons.

References in periodicals archive ?
Investigations on reproductive biology and aquaculture potential of Unio terminalis delicatus inhabiting Golbasi lake Hatay.
A fuller account of the historical circumstances can be found in Lacko, Unio Uzhorodensis, pp.
From Purgatorious Unio, the prototypical mammal at the root of the primate family, to Homo Sapiens Neanderthalensis, mankind's most distant relatives have been reconstructed and brought back to life in three-dimensional form.
Meeting the farmers in Diwak Sub village to talk about Food Storage and Creedit Unio
At sites with populations of Unio crassus, this means that the requirements according to one set of old laws are in conflict with current EU legislation, which is designed to protect rare species and vulnerable habitats.
These are: Emys orbicularis, Mauremys leprosa, Barbus meridionalis and Unio elongatulus.
Springbok lock Victor Matfield could get to 21 22 Weight in stones of the 23 heaviest player, France prop Unio Atonio, but he could be run close by some late bulking.
Anos mas tarde llego a Chile acompanando al grupo dirigido por el conquistador Francisco de Aguirre, al que se unio en Atacama, junto a Francisco de Villagra y a Pedro de Valdivia, en marcha de la conquista de Chile.
In Barcelona, another left-wing coalition headed by former community activist Ada Colau and backed by Podemos beat pro-independence parties Convergencia i Unio (CiU) and Esquerra Republicana de Catalunya (ERC), in a setback for the Catalan separatist movement.
In E Class, Manchester City beat Unio Esportiva Quart 6-1 in the quarter-finals whereas Anji FC was beaten by Valencia 2-7.
Meek (1) assigned Unio nebrascensis to Margaritona (now Margaritifera) with the knowledge that he lacked certain morphological evidence and a convincing philosophical argument.
TABLE 1: THE FIVE PARTIES SUPPORTING THE PARTICIPATORY PROCESS POSITION ON THE FUTURE PARTY IDEOLOGY OF CATALONIA Convergencia Democratica Centre-right Independence de Catalunya (CDC) Unio Democratica de Centre-right Increased autonomy within Catalunya (UDC) Spain Esquerra Republicana de Centre-left Independence Catalunya (ERC) Iniciativa per Catalunya Left Increased autonomy within (ICV) Spain Candidatura d'Unitat Far left Independence Popular (CUP)