合浦珠母贝寄生多毛类流行病学调查及生活史分析word格式论文.docxVIP

优秀毕业论文 精品参考文献资料 3. Histology The histology research demonstrated that these three kind of polychaetae are similar to Annelid polychaeta common species, the body can divide into the epidermal, the muscle and the body cavity. The epidermal layer structure demonstrated that Sabellidae does not have the cuticle thin film which secreted by the epidermis cells, while the other two kinds have. The epidermal layer is basic make up by single layer columnar epithelium cell, including the gland cell and the sensory cell. The gland cell types are slightly different in the three species. Muscle of these three species are smooth muscle, the muscle of Sabellidae and Spionidae are composed by circular muscle 、 transverse muscle 、 longitudinal muscle and musculus muscle, the muscle of Capitellidae are composed by circular muscle、transverse muscle and musculus muscle. Histopathological impact of the pearl oyster Pinctada fucata caused by Polydora The situation of Pinctada fucata infected by Polydora had been divides into mild infection, moderate infection, and severe infection. Histopathology of the mantle, branchiae, adductor muscle and digestive diverticula of Pinctada fucata had been studied, the results showed that: the mantle’s epithelial cell had defluvium, the structural of its connective tissue trend to disorder, muscle fibre trend to be histolysis; branchiae lamella trend to be histolysis and epithelial cell had defluvium; adductor muscle fibers trend to augment interval, breakage and histolysis; digestive diverticula trend to cytolysis and vacuolization. The Embryos and Larval Development of Polydora from Pinctada fucata The results indicated that when the temperature was controlled at 25±1℃, 6-8 days are required for eggs in the egg-bag grown into 2-setiger pelagic larvae, then entered the water. Out of the egg-bag 24 hours, it developed to 3 –setiger ； 18 days after, the 15-setiger pelagic larvae begin to metamorphose; when 25day, t