摘要
三疣梭子蟹的消化道分前肠、中肠和后肠，前后肠起源于外胚层，腔内有角质衬里，中肠起源于内胚层，腔内无角质层。消化管壁均由上皮层、结缔组织层、肌肉层和外膜组成。前肠包括口腔、食道和胃，食道壁内褶形成食道嵴，食道嵴的折叠程度以及食道放射肌的排列密度随幼体发育而增加。胃的结构复杂，其内的角质层特化成前部的胃磨和后部的腺滤器。胃磨、腺滤器、贲门胃和幽门胃之间的比例以及贲门－幽门瓣在幼体发育过程中变化明显。中肠的前端背面有一对前盲囊管，沿胃的背面向前延伸，在发育上有长度的变化。中肠后端背面发出一支后盲囊管，在Ｚ２形成，随后逐渐延长并发生弯曲。后肠始于腹部第二节，在蚤状幼体时最长可达中肠的两倍多，大眼幼体后随着腹部的退化而明显缩短。
The effect of bioturbtion of Nuttallia olivacea on the vertical distribution of sediment particles was studied with glass beads. After 10 days' biotubation by the species, 47% of the glass beads on the surface were transferred downward to a maximum depth of 12cm, and the vertical transportation rate of sediment particles was 1.80×10 -5 .g -1 .cm -2 .d -1 ; for glass beads at a depth of 10cm, 45% were transferred upwards to a minimum depth of 3cm with a transportation rate of 1.89×10 -5 .g -1 .cm -2 .d -1 , 15% were transferred downward to a maximum depth of 16cm with a transportation rate of 0.63×10 -5 .g -1 .cm -2 .d -1 。
基金
联合国教科文组织项目资助
