Department of Biology, Faculty of Science, Gazi University, Ankara, Turkey.
Department of Plant Protection, Faculty of Agriculture, Bingöl University, Bingöl, Turkey.
Microsc Res Tech. 2020 Sep;83(9):1153-1162. doi: 10.1002/jemt.23507. Epub 2020 Jun 1.
In this study, ananatomical and histological study was conducted on the alimentary canal of Tanymecusdilaticollis (Coleoptera: Curculionidae), which is an economic polyphagous pest species, to study the relationship between the structure of the alimentary canal and the feeding habit. Therefore, the structure of the alimentary canal of T. dilaticollis was examined using light and electron microscopies. Results have shown that the alimentary canal in T. dilaticollis is consisted of three separate regions as foregut, midgut, and hindgut structurally between the mouth and the anus, which pass from head, thorax, and abdomen. The foregut consists of pharynx, esophagus, crop and proventriculus and in the crop part, expansion is seen compared to other foregut parts. Midgut of T. dilaticollis is the largest part of digestion system. The anterior region of midgut is twofolds wider than the posterior region. The posterior midgut extends tubularly and it is connected to eightgastric caeca. The hindgut of T. dilaticollis consists of fourparts as pylorus, ileum, colon, and rectum. Well-developed muscle layers are found near the rectum and genital chamber. These results contribute to further studies on the ecology and biological control agents of Coleoptera and to provide a broad comparison of alimentary canal of Coleoptera species.
本研究对一种经济多食物害虫——宽颈谷象（鞘翅目：象甲科）的消化道进行了解剖学和组织学研究，旨在研究消化道结构与取食习性之间的关系。因此，我们使用光学显微镜和电子显微镜来观察 T. dilaticollis 的消化道结构。结果表明，T. dilaticollis 的消化道在结构上由前肠、中肠和后肠三部分组成，从前到后依次为口、头、胸和腹。前肠包括咽、食管、嗉囊和前胃，其中嗉囊部分较其他前肠部位扩张。T. dilaticollis 的中肠是消化系统中最大的部分。中肠的前区比后区宽两倍。后中肠呈管状延伸，并与八个胃盲囊相连。T. dilaticollis 的后肠由四个部分组成：幽门、回肠、结肠和直肠。在直肠和生殖腔附近发现了发育良好的肌肉层。这些结果有助于进一步研究鞘翅目昆虫的生态学和生物防治剂，并为鞘翅目昆虫的消化道提供广泛的比较。
