中华稻蝗全消化道内壁显微结构观察

Microstructure of the inner alimentary canal in Oxya chinensis (Orthoptera: Acrididae)

本文采用扫描仪和扫描电镜对中华稻蝗消化道内壁的细微结构进行了系统观察和研究。结果表明,中华稻蝗食道内壁由纵行脊组成,前端有齿。嗉囊包括两段,前段的一个小的膨大部分,由V-形区和两侧的V-形脊组成,只在前端内壁有齿;后段为一个大的膨大部分,由柳叶脊、扇形脊和不规则脊组成,脊的上缘有齿。前肠内壁的齿主要为单生齿,除贲门瓣上齿的齿尖指向前方外,全部齿的齿尖指向后方。后肠的前端为12个幽门瓣,内壁有齿。回肠和结肠由6条纵行脊组成,结肠内壁有齿。直肠的齿在除直肠垫外的直肠内壁上。后肠的齿主要为丛生齿,后肠除直肠内壁齿的齿尖指向附着环外,全部齿的齿尖指向后方。根据我们的观察,对前肠提出了新的分区。

The microstructure of Oxya chinensis alimentary canal was systematically observed with scanner and scanning electron microscope. The results show that the inner walls of the esophagus consist of longitudinal ridges, with teeth at the front tip. The crop is composed of two parts. The front part has a small bulge, which is formed by V-shape belt and the V-shape ridges on either side of the belt. Teeth are seen only at the front tip of the inner walls. The rear part of the crop has a large bulge, which is composed of lance ridges, fan-shape ridges and irregular ridges. There are teeth on the top part of the ridges. The teeth in the inner walls of the foregut are mainly of single tooth. All the teeth point to the back except the ones on the stomodaeal valves, which point to the front. The front part of the proctodaeum consists of 12 pyloric valves, with teeth on the inner walls. The ileum and colon are composed of six longitudinal ridges, with teeth on the inner walls of the colon. There are teeth on the inner walls of the rectum except the rectal pad. The teeth of the proctodaeum are mainly tufted teeth, all pointing to the back except the ones in the inner walls of the rectum, which point to the attachment ring. A new scheme for zoning of foregut was proposed based on our observation.