关键词: 稀有鮈鲫, 组织形态学, 细化系统, 神经系统

Abstract: Ob jective The histological description of digestive and neurvous systems was given by systematically observation of adult Gobiocypris rarus，which provides a more complete background of differentmammal studies on the evolution of these systems， with the detailed pictures.Method Healty adult Gobiocypris rarus were fixed，decalcified，dehydrated and vertrified in order.The specimen in solid paraffin was cut into serial slices with thickness of 3μm.The slices were dyed by Hematoxylin and Eosin（H&E）staining.The section pictures of the organs in the fish were described when observation and collection through a optical microscope were finished.Result Pharyngeal teeth，as a marker divides the pharynx conncected cavity and intestine of Gobiocypris rarus.The anterior intestine is enlaged to a“Z”，while the posterior seems to be straight.The liver， in which there are distinct central veins but typical lobule，is covering the intestine.Gall bladder， next to the heart， is singly located in the front of the thoracic cavity.Pancreas or livers with exocrine pancrestic tissue has not been observed in the fish.The brain， the most important part composed the CNS of Gobiocypris rarus， whose substances of telencephhalon， diencephalon， mesencephalon， metencephalon and myelencephaloncan have been fully developed and easily observed.Conclusion There is no stomach in Gobiocypris rarus which is accorded with the characteristic of Cyprinidae fish.Distinguished differences have been found between the intestines from anterior and posterior segments.In a degree，the nervous system of the species is fully developed.

Key words: Gobiocypris rarus, histomorphology digestive system, nervous system