Incubation of eggs and embryonic development of the fiddler crab, Uca lactea (Decapoda, Brachyura, Ocypodidae)

The average incubation period of Uca lactea is 15.4 days. Fifteen stages of embryonic development were categorized by following the daily progress. On the first day, newly laid eggs became 32-celled eggs. The longest diameter of undivided eggs was 0.24 mm, which increased to 0.32 mm before hatching.