Chen Longyan, Liu Meike, Di Giulio Andrea, Chen Xinxin, Sabatelli Simone, Wang Wenkai, Audisio Paolo
Institute of Entomology, College of Agriculture, Yangtze University, Jingzhou 434025, China.
Department of Science-L.I.M.E., University of Roma Tre, 00146 Rome, Italy.
Insects. 2023 Mar 20;14(3):298. doi: 10.3390/insects14030298.
() is a highly specialized species of Nitidulidae in China that takes pollen as its main food source, and its main host plant is L. (Rosaceae). In this study, the structural morphology of the alimentary canal and Malpighian tubules of adult . (.) was observed under light, fluorescence, and scanning electron microscopy. The alimentary canal of adult . (.) is divided into foregut, midgut, and hindgut. The foregut is the shortest and consists of the pharynx, esophagus, proventriculus, and cardiac valve. The midgut is a straight, distended, cylindrical, thin-walled tube. Numerous blunt-fingered gastric ceca are distributed irregularly throughout the midgut. The hindgut is subdivided into the ileum, colon, and rectum. The ileum is coiled. The colon gradually enlarges posteriorly. The rectum is thickly muscled and followed by a membranous structure. The openings of proximal Malpighian tubules are evenly inserted into the junction of the midgut and hindgut, and distal Malpighian tubules are evenly attached to the colon to form a cryptonephridial system. In this study, we also compare the structure and infer the function of the alimentary canal and Malpighian tubules among beetles, as well as discuss the evolutionary and taxonomical implications.
（）是中国露尾甲科中一种高度特化的物种，以花粉为主要食物来源，其主要寄主植物是蔷薇科的李属植物。在本研究中，在光学显微镜、荧光显微镜和扫描电子显微镜下观察了成年（.）的消化道和马氏管的结构形态。成年（.）的消化道分为前肠、中肠和后肠。前肠最短，由咽、食管、前胃和贲门瓣组成。中肠是一条笔直、扩张的圆柱形薄壁管。许多钝指状的胃盲囊不规则地分布在整个中肠。后肠分为回肠、结肠和直肠。回肠盘绕。结肠向后逐渐扩大。直肠肌肉发达，后面跟着一个膜状结构。近端马氏管的开口均匀地插入中肠和后肠的交界处，远端马氏管均匀地附着在结肠上，形成一个隐肾系统。在本研究中，我们还比较了甲虫消化道和马氏管的结构并推断其功能，以及讨论其进化和分类学意义。
