【摘要】 中国鲎的消化道可分为口,食道、胃,幽门、前肠、后肠、直肠和肛门等,肝是主要消化腺,一对肝管开口于前肠。鲎是底栖肉食性动物、其胃壁具有厚的角质层,小刺和齿的特殊结构。消化道由桨膜,肌肉层,粘膜下层和粘膜层等四层组成。鲎胃的肌肉排列和头足类的相似,而肠管的则酷似硬骨鱼类的,这与其进化位置相一致。组织化学特点是PAS反应特别在各器管的肌肉组织为强反应,这点与高等动物是相似的。蛋白质是以汞溴酚兰反应,茚三酮—Schiff反应在各组织内含量都多。在所有角质层的外缘、小刺等是以半脱氨基酸SH基反应最强,这与产生角质有关。从口至幽门粘膜上皮与肠的纤毛带对脂类反应着色最深,说明含脂量最多。更多还原

【Abstract】 The digestive tract of Chinese Horseshoe crab. Tachypleus tridentatus can be divided into mouth, oesophagus, stomach, pylorus, fore-gut, hind-gut, rectum and anus, and composed of fo four layers, i,e, serosa, muscular coats, Submucosa, and mucosa Liver is the major digestive gland with a pair of heptic duct opening into fore-gut. There is a thick specilized horny layer with some small spinus and horny teeth on inner lining of stomach responding to its feeding habit. The arrangement of musculatura of stomach is allied to that of cephalopods, while these in intestine almo-tly resemble those of vertebrates.Certain histochemical observations made on the digestive system have indicated the presence of polysaccharide and protein in the muscular tissue of various digestive organs numerous base protein in muco-epithelial layer, sulfhyryl-cysteine in the outer border and spinules of horny layer, and numerous lipid droplets in muco-epithelial and brush border of intestine.Based on the features of digestive tract. the evolutionary status of Tachypleus has also been discussed.更多还原