Author(s)

Lin Song, Jiangu Wu, Xiaojiang Chen, Xiaolong Huang, Yan Shao

Corresponding Author

Xiaojiang Chen

ABSTRACT

in order to understand the morphological structure characteristics of the stomach and intestinal tract of Sinogastromyzon szechuanensis, we observed and studied the morphological and histological structure characteristics of the gastrointestinal tract of Sinogastromyzon szechuanensis by means of anatomy, tissue section and light microscopy. The results show that the stomach of Sinogastromyzon szechuanensis is U-shaped, and the intestinal tract is composed of three parts: foregut, midgut and hindgut. The coefficient of intestinal tract is 1.42 ± 0.20. The stomach and intestine consist of mucosa, submucosa, muscle layer and serosa. The gastric glands in the stomach are very developed, the wrinkles in the internal surface of intestine are very developed, the mucosal epithelium is a single-layer columnar epithelium, and on the free surface of it, there is the striated border formed by the dense arrangement of microvilli; the goblet cells are distributed among the epithelial cells, and the number of goblet cells gradually increases from the foregut to the hindgut. The number of wrinkles of intestinal mucosa gradually decreases from the foregut to the hindgut, and the height also decreases, while the thickness of muscle layer gradually increases. The results show that the morphological and histological structure characteristics of the stomach and intestinal tract of Sinogastromyzon szechuanensis are adapted to its omnivorous and partial carnivorous nature.

KEYWORDS

Sinogastromyzon szechuanensis, morphology, histology