中文摘要：

采用解剖、石蜡切片-显微技术观察了细鳞斜颌鲴（Plagiognathops microlepis）消化道的形态结构特征。结果表明：消化道由口咽腔、食道及肠构成。口咽腔具咽齿,齿式为3.7.3/3.7.3;舌小、呈三角形,其表面被覆复层扁平上皮,具味蕾。食道和肠均由粘膜层、粘膜下层、肌层和外膜组成。食道内壁的皱襞较发达,其粘膜层为复层扁平上皮,有许多杯状细胞分布其中,可见少量味蕾。肠长而盘曲,肠长指数为4.49±0.58;前、中、后肠肠绒毛发达程度有所不同,前肠最发达,粘膜层为单层柱状上皮,游离面具微绒毛,杯状细胞在前、中肠较多,后肠较少。细鳞斜颌鲴消化道形态结构与其杂食性相适应。

英文摘要：

The present study aims to describe the morphological characteristics of the digestive tract in Plagiognathops microlepis by vivisection,paraffin section and light microscopy. The results showed that the digestive tract of these fish consisted of oral- pharyngeal cavity,esophagus and intestine. The arrangement of their pharyngeal tooth in the oral- pharyngeal cavity was 3. 7. 3 /3. 7. 3. The tougue was small and triangular,its mucosa surface with taste buds was covered with stratified aquamous epithelium. The esophagus and intestine consisted of mucous,submucosa,muscularis and adventitia. Well- developed plica was present in the esphagus,of which the mucous epithelium was stratified squamous epithelium,including abundant goblet cells and a few taste buds. The intestine was long in length and curve- sharped. The index of the the intestine length was 4. 49 ± 0. 58. Intestinal villi on the foregut were much more developed than that of the midgut and hindgut. The mucosa layer appeared simple columnar epithelium and the free surface is full of microvilli. The goblet cells of the mucous were much more abundant in the foregut and midgut than in the hindgut. The results indicated that the digestive tract morphology of Plagiognathops microlep is adapted to its omnivorous nature.