科研之友
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摘要
This study reports on the embryogenesis of Heliconius erato phyllis between blastoderm formation and the prehatching larval stage. Syncytial blastoderm formation occurred approximately 2h after egg laying (AEL) and at about 4h, the cellular blastoderm was formed. The germ band arose from the entire length of the blastoderm, and rapidly became compacted occupying approximately two-thirds of the egg length. At about 7h AEL, protocephalon and protocorm differentiation occurred. Continued proliferation of the germ band was followed by penetration into the yolk mass, forming a C-shaped embryo at about 10h. Approximately 12h AEL, the gnathal, thoracic and abdominal segments became visible. The primordium of the mouthparts and thoracic legs formed as paired evaginations, while the prolegs formed as paired lobes. At about 30h, the embryo reversed dorsoventrally. Approximately 32h AEL, the protocephalon and gnathal segments fused, shifting the relative position of the rudimentary appendages in this region. At about 52h, the embryo was U-shaped in lateral view and at approximately 56h, the bristles began evagination from the larval cuticle. Larvae hatched at about 72h. We found that H.erato phyllis followed an embryonic pattern consistent with long-germ embryogenesis. Thus, we believe that H.erato phyllis should be classified as a long-germ lepidopteran. The study of H.erato phyllis embryogenesis provided a structural glimpse into the morphogenetic events that occur in the Heliconius egg period. This study could help future molecular approaches to understanding the evolution of Heliconius development.
- 出版日期2014-8
