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Embryonic and early postembryonic development of the burrowing crayfish, Virilastacus araucanius (Faxon, 1914) (Decapoda, Parastacidae) under laboratory conditions

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The stages and duration of the embryonic and early postembryonic development of the burrowing crayfish, Virilastacus araucanius are described, in water at temperatures between 10.0 and 21.0°C, with 8.5 to 9.0 mg/l of dissolved oxygen, pH 6.8 to 8.5, and hardness of 49.8 ppm CaCO3. The morphological changes observed on the egg surface allow to distinguish 5 embryonic stages. After hatching, two moults separate three juvenile stages. The first two juvenile stages lack uropods and remain attached to the female. In stage 3, the juvenile is similar to the adult, both in morphology and behaviour, and becomes independent from the mother. Embryonic development lasts 120 days, and the postembryonic stages take another 20 days until the emergence of juvenile stage 3. The development is direct, with incubation of large eggs, rich in yolk, and parental care over juvenile stages 1 and 2.

Se describen los estados del desarrollo embrionario y postembrionario temprano del camarón excavador Virilastacus araucanius, y la duración de ellos en aguas a temperaturas entre 10,0 y 21,0°C, con 8,5 a 9,0 mg/l de oxígeno disuelto, con pH entre 6,8 y 8,5 y una dureza de 49,8 ppm de CaCO3. Los cambios morfológicos observados en la superficie de los huevos, permiten distinguir 5 estados embrionarios. Luego de la eclosión dos mudas separan 3 estados juveniles. Los dos primeros juveniles carecen de urópodos y permanecen sujetos a la hembra. El tercero es igual al adulto en su morfología y comportamiento e inicia una existencia independiente de la madre. El desarrollo embrionario tiene una duración de 120 días y el postembrionario tarda otros 20 días hasta que emerge el tercer juvenil. El desarrollo es directo con incubación de huevos grandes, ricos en vitelo, con cuidados parentales que incluyen los dos primeros estados juveniles.


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