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In this paper, the early embryonic development of Rana nigromaculata in Huaihua Agricultural College was studied. Frogs caught in the field were kept in captivity, eggs were collected in laboratory Petri dishes and cultured at 65 08℃ with water. Based on the main physiological changes and characteristics of embryo formation, the early embryonic development of Rana lateralis with black spots was divided into 26 times, and observed and measured by a photographic stereo microscope. The results showed that the whole complete period from fertilized egg to gill cover lasted 202.87 (5.36) h (n = 9) so far. This paper describes the morphological characteristics of each period and discusses the formation and degeneration of Chuqi. The similarities and differences between Huaihua area and other areas have been reported.

In this paper, the early embryonic development of Rana nigromaculata in farmland around huaihua university was studied. The frog was caught in the wild and brought back to the laboratory for breeding. Collect fertilized eggs, put them in Petri dishes and cultivate them with spring water at 65438 08 ~ 25℃. According to the morphological changes and main physiological characteristics of the embryo, the early embryonic development of Polygonum nigrum was divided into 26 stages, and observed and measured with a photographic stereomicroscope. The results showed that the whole embryo development lasted (202.87 5.36) h (n = 9) from fertilized egg to gill cover completion stage. This paper describes the morphological characteristics of each period, discusses the formation and degeneration of sucker in embryonic development, and the similarities and differences between Huaihua area and other areas.