中文摘要：

对半滑舌鳎Cynoglossus semilaevis胚胎发育进行了组织学观察，首次描述了半滑舌鳎胚胎发育过程中脊索、眼囊、中胚层、脊髓底板、神经管、肠、耳囊、脑、口咽膜和心管等组织结构。半滑舌鳎眼原基出现后，肌节在胚体后部开始分化。随后神经管前端不断膨大形成脑原基，脑形成之后在后脑的后面形成耳囊。胚体形成后，脊索位于脑的腹面，在胚胎发育过程中脊索细胞空泡化。肠位于脊索腹面。脊索背部有一排立方体细胞，为脊髓底板，脊髓底板位于神经管腹面并延伸到后脑前端。心脏是含有红血球的一个薄壁管，位于胚体头部腹面，且与中脑平行。

英文摘要：

The embryonic development of Cynoglossus semilaevis was observed with tissue slice method. Notochord, optic vesicle, mesoderm, spinal cord floor-plate, neural tube, gut, otie vesicle, brain, oropharyngeal membrane and tubular heart of C. semilaevis embryo were described for the first time. The result indicated that, myomeres were initial differentiated at the back of the embryo after formation of the optic primordium. Then the neural keel was enlarged anteriorly to form the brain rudiment. After formation of the embryo, the otic vesicle presented behind the hindbrain. The notochord was ventral to the brain. During the development of the embryo, the cells of the notochord were vacuolated and beneath the noto- chord was the gut. Dorsal to the embryo was a row of cuboidal cells, the spinal cord floor-plate. This plate was ventral to the neural tube. The floor-plate extended anteriorly to the hindbrain. The heart was a thin-walled tube containing erythrocytes. It was ventral to the head paralleled with diencephalon.