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Genus Myleus

(Müller and Troschel 1845)

Common Names: Red Hook Myleus (Red Hook Metynnis).

 

 

 

 

 

 

 

FROM FRANK MAGALLANES

 

This species, besides being an aquarium fish favorites is found in tropical America. This species complex is widely distributed in lowland areas of South America east of the Andes, including the Amazon, Orinoco, and Parańa (Paraguay River) basins and various coastal drainages of the Guiana's (Géry 1977). The species grows to about 15 cm SL and is a food items for natives.

 

VALID SPECIES LIST 2011

 

Myleus altipinnis

Valenciennes 1850

 

Săo Franciso River basin, Brazil

 

Myleus arnoldi

Ahl 1936

 

Amazon, Xingu and Tocantins River basins, Brazil

 

Myleus knerii

Steindachner 1881

 

Maroni River basin, French Guiana

 

Myleus levis

Eigenmann & McAtee 1907

 

Paraguay-Paraná River basin: Brazil and Paraguay

 

Myleus lobatus

Valenciennes 1850

 

Amazon and Orinoco River basins: Brazil, Peru and Venezuela

 

Myleus micans

Lütken 1875

 

Săo Francisco River basin, Brazil

 

Myleus pacu

Jardine 1841

 

Essequibo River, Guyana

 

Myleus rhomboidalis

Cuvier 1818

 

Amazon River basin and northern and eastern Guiana Shield rivers: Brazil, French Guiana, Guyana, Suriname and Venezuela

 

Myleus schomburgkii

Jardine 1841

 

Middle and lower Amazon River basin, Nanay River, upper Orinoco River basin: Brazil, Peru, Suriname (?) and Venezuela

 

Myleus setiger

Müller & Troschel 1844

 

Tributaries of lower and middle Amazon River basin, orinoco River basin, upper Orinoco River and tributaries, and northern and eastern Guiana Shield rivers: Brazil, Guyana, Suriname and Venezuela

Myleus ternetzi

Norman 1929

 

French Guiana

 

Myleus torquatus

Kner 1858

 

Amazon, Negro and Orinoco River basins: Brazil and Venezuela

 

 

 

 

If you are owner of this photo, please contact OPEFE for credit.

Myleus species

from Rio Xingu. Submitted by P-Fury hobbyist.

Juvenile Myleus tiete

(Eigenmann and Norris,1900)

 

Leydig cells in Myleus ternetzi testes

Maurice Loir, Anne Margeridon and Chantal Cauty

INRA, Physiologie des Poissons, Campus de Beaulieu, 35042 Rennes Cedex, France

(Received 2 September 1988, Accepted 18 January 1989).

 

ABSTRACT


Males of Myleus ternetzi, at various maturation stages were netted in a French Guyana river. Testes were histologically and ultrastructurally analysed. Leydig cells were always present in large numbers. In mature or almost mature testes, they were characterized by a large spherical nucleus and an extensively developed smooth endoplasmic reticulum (SER) composed of very narrow tightly packed tubules. In regressed testes, most of the Leydig cells had a smaller nucleus with an irregular shape, a disorganized SER and the fine structure of the mitochondria was greatly affected. These changes would reflect different phases throughout a metabolic cycle in relation to spermatogenesis.

 

REFERENCES 

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UPDATED: 12/28/2011