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The abbreviated larval development of Macrobrachium totonacum Mejía, Alvarez & Hartnoll, 2003 (Decapoda, Palaemonidae), reared in the laboratory

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Abbreviated larval development is described and illustrated for Macrobrachium totonacum Mejía, Alvarez & Hartnoll, 2003, a recently described freshwater prawn with three larval stages. The study is based on laboratory-reared material. Females carry 18 eggs on average, with a maximum of 28. The average egg diameter is 2.1 mm. The first larval stage has sessile eyes, and all appendages are developed except the uropods; however, the chelae on pereiopods 1 and 2, and the pleopods, are non-functional. In stage 2 the eyes are articulated, and the chelae and pleopods are functional. In stage 3 the uropods are developed. The larvae are lecithotrophic in the first two stages, and start feeding in stage 3. The larval development of this species is compared with other Mexican and South American species of Macrobrachium with abbreviated development: it has the same number of stages as M. vicconi Román, Ortega & Mejía, 2000, another Mexican species. El desarrollo larval abreviado es descrito e ilustrado para Macrobrachium totonacum Mejía, Alvarez & Hartnoll, 2003, una especie de langostino recientemente descrita con tres estados larvales. Este estudio esta basado en material obtenido en laboratorio. Las hembras llevan en promedio 18 huevos y un máximo de 28. El diámetro promedio del huevo es de 2,1 mm. El primer estadio larval tiene ojos sésiles y todos los apéndices están desarrollados excepto los urópodos; sin embargo, la quela de los pereiópodos 1 y 2 y los pleópodos no son funcionales. En el estado dos, los ojos están articulados y la quela y pleópodos son funcionales. En el estado tres los urópodos están desarrollados. Las larvas son lecitotroficas en los primeros dos estadios e inician su alimentación en el estado tres. El desarrollo larval de esta especie es comparada con otras especies de Macrobrachium de México y Sudamérica con desarrollo abreviado, esta especie tiene el mismo número de estados que otra especie mexicana: M. vicconi Román, Ortega & Mejía, 2000.

Affiliations: 1: Lab. de Bioespeleología y Carcinología, Universidad de Quintana Roo – Cozumel (UQROO – Cozumel), DDS, Dpto. Ciencias y Humanidades, Avenida Andrés Quintana Roo s/n, Cozumel 77640, Quintana Roo, Mexico; 2: School of Biological Sciences, University of Liverpool, U.K.; 3: Lab. de Biología Evolutiva y Genética de Poblaciones, Universidad de Quintana Roo – Cozumel (UQROO – Cozumel), DDS, Dpto. Ciencias y Humanidades, Avenida Andrés Quintana Roo s/n, Cozumel 77640, Quintana Roo, Mexico


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