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image of Journal of Crustacean Biology

ABSTRACT Macrobrachiumpetronioi, a native Brazilian fresh-water shrimp, was captured along the coast of Rio Branco, Cananéia. Sao Paulo State, Brazil. The eggs were green-black in early development and the average size was 1.21 mm by 0.98 mm. Macrobrachium petronioi has no free-swimming larval phase. However, newly hatched larvae possessed several zoea I characters. Therefore, they were clearly more developed than newly hatched larvae of other species of Macrobrachium with prolonged larval development. The average duration of larval development in M. petronioi was 5.5 days. During early development, the larvae subsisted on stored yolk. After the third molt, the postlarvae accepted food. The three zoeal stages prior to the postlarval stage were described and characterized, with detailed morphological analyses. This species has a partially abbreviated type of development. The larval development of M. petronioi is distinguished from that of M. potiuna.


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