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 ?
6), but the shell of other species like Unio or Anodonta could also present a similar ornamentation to this species (Kennard, Salisbury and Woodward, 1925).
A estos, se les unio la trompeta elocuente de Juaneito Torres quien, junto a Edgar Nevarez, sustituyeron a los trompetistas de esa epoca: Maelo y Cocolia.
"We are always attentive to the demands of the consumers and with the Unio brand, the most remembered by the Brazilian consumers, we are able to innovate and surprise once more.
A principios de 1989, gracias a un amigo en comun, conocieron a Meme, quien se unio al conjunto como tecladista.
AGU has introduced its "UNIO" educational system, which is based on cloud computing in medical education.
Mas tarde se unio al movimiento insurgente y alcanzo el grado de general.
Despues de que los franceses habian sido derrotados, a su paso por Tehuantepec se unio a ellos un tal Remigio Toledo (de origen espinaleno, casado en Tehuantepec con una blasena), y los tehuantepecanos, al verlos hambrientos y en desbandada, no los atacaron, por razones humanitarias.
in kymijoki there is an unio crassus, which is also a nationally endangered species, in accordance with annex iv (a) to the eu habitats directive.
LA plana mayor de los artistas espanoles se unio a la gala solidaria Por ellas, que por segundo ano consecutivo organizo la emisora de radio Cadena 100, a beneficio de la Asociacion Espanola Contra el Cancer.
Mexico se unio a la APEC en 1993, para intensificar sus relaciones con las economias de la zona.
De ahi, Wenders se unio en julio a la tropa de musicos con Compay Segundo y Ruben Gonzalez para los conciertos de Amsterdam y el Carnegie Hall de Nueva York; pero algunos criticos consideran que esto ultimo fue desperdicio de musica en vivo, al excederse el cineasta recogiendo imagenes durante 12 horas de los ensayos en Holanda.