Preliminary observations on embryonic development of uzifly, Blepharipa zebina Walker (Diptera: Tachinidae) | Observations préliminaires sur le développement embryonnaire de la mouche uzi, Blepharipa zebina Walker (Diptera: Tachinidae)
2001
Ram Kishore ((Central Tasar Research and Training Institute, Ranchi (Inde))) | Sharma, S.P. | Sharan, S.K. | Sinhadeo, S.N. | Thangavelu, K.
Gross morphological features of the embryo of uzify Blepharipa zebina Walker (Diptera: Tachinidae), a serious endoparasitoid of silkworm, Antheraea mylitta Drury (Lepidoptera: Saturniidae) is described for the first time. Observations are based on the embryos that can be clearly seen in the live eggs through stereoscopic dissecting microscope and compound microscope. The freshly laid egg is enclosed in a transparent membrane. The creamy white eggshell is covered with glue mucilagenous layer and chorion is beset with minute hair like structures. There is a circular operculum situated on the antero-dorsal region. The embryonic development is broadly divided into five distinct stages. The yolk in a fertilised egg is dispersed in a cytoplasmic network, which is observed in the periphery. In the first stage of development, no change is observed up to 6h. In the second stage (6 - 24 h) a distinct border of blastodermal cells is clearly seen on the periphery of the egg while in the third stage (24 - 39 h) embryonic tissue expands. The onset of fourth stage is characterised by the appearance of body segments, which become distinct at 57h. During fifth stage (60 - 72h) a recognizable larval form is seen. Hatching takes place through operculum and the maggot takes 20-25 minutes to emerge from the eggshell. The experiment was conducted at an average temperature of 24 +/- 1 degrees C and 60 +/- 5/ RH
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