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External description of the embryonic development of the prawn, Macrobrachium americanum Bate, 1868 (Decapoda, Palaemonidae) based on the staging method

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image of Crustaceana

The embryonic changes during the development of the freshwater prawn, Macrobrachium americanum are described from observations made on live embryos based on the percentage-staging method. Eggs were observed with a stereomicroscope to obtain descriptions of embryonic periods. This prawn has an incubation time of 18 days at 24°C. Ten periods are described and illustrated. A comparison of this developmental process with those of congeneric species is included. Se describen los caracteres externos del desarrollo embrionario del langostino dulceacuícola Macrobrachium americanum tomando como criterio el método de estadios fijos basado en porcentajes. Los huevecillos fueron observados en vivo con un microscopio estereoscópico y se descibe cada periodo de desarrollo. Los huevecillos tardan 18 días en incubarse a una temperatura de 24°C. Diez periodos se describen e ilustran. Se compara el desarrollo con el de algunas especies cercanas.

Affiliations: 1: Centro Interdisciplinario para el Desarrollo Integral Regional, Unidad Oaxaca, Calle Hornos No.1003, 71230, Santa Cruz Xoxocotlan, Oaxaca, P.O. Box 674, Mexico; 2: Laboratorio de Invertebrados Bentónicos, Unidad Académica Mazatlán, ICML, UNAM, P.O. Box 811, Mazatlán, Sinaloa 82000, Mexico


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