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普通齿蛉幼虫的消化系统结构和取食分析
The structure of alimentary system and feeding analysis of the larva of Neoneuromus ignobilis
陈申芝1,卿玉涛2,朱晓英1,黄成军1,曹成全1**
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DOI:
作者单位:1 乐山师范学院峨眉山生物多样性保护与利用研究所乐山614004; 2 乐山师范学院图书馆乐山614004
中文关键词:普通齿蛉, 幼虫, 消化系统, 解剖, 电镜扫描, 取食
英文关键词:Neoneuromus ignobilis,larva, alimentary system, anatomy, scanning electron microscope, feed
中文摘要:

     研究了普通齿蛉Neoneuromus ignobilis Navás幼虫消化系统的解剖和电镜扫描结构,并结合肠道内食物残渣的成分分析了其取食特性。结果表明,普通齿蛉幼虫消化系统较为简单,无特殊的变异,消化道细长,由前肠、中肠和后肠构成,前后肠较长,分别占体长的42%和47%,中肠最短,仅占总长度的11%。前肠由食道、嗉囊、前胃组成,嗉囊明显膨大呈囊状,内部结构特殊,有6个相同的几丁质结构呈圈环状排列于嗉囊内壁。唾腺1对,位于下颚两侧,每条唾腺由约30根细丝聚成束棒状;胃盲囊4条,较为粗短;马氏管7条,细长。食物残渣多分布在前肠和后肠,多为黑褐色食糜、砂粒和动物体壁,说明普通齿蛉幼虫为肉食性,且多取食动物体内柔软的组织,有时还会吞进砂粒。 

英文摘要:  

         The anatomy of the alimentary system of Neoneuromus ignobilis Navás larvae was studied by observation and scanning electron microscopy and their feeding characteristics combining with the composition of food residue in the intestinal tract was analyzed. The alimentary system of the N. ignobilis larva was simple with no special features. The tenuous alimentary canal was composed of foregut, midgut and hindgut. The foregut and hindgut were longer, comprising 42% and 47% of the total body length respectively, whereas the midgut was shorter, comprising only 11% of total body length. The foregut was composed of oesophagus, crop and proventriculus. The crop was greatly distended like a bladder. The inner structure of the crop was very unusual with six chitinous structures arranged in the crop wall like a ring. Paired, fascesshaped, salivary glands, each of which was composed of about 30 filaments, were located in the two flanks of each mandible. There were four gastric cecae, thicker and shorter. Seven Malpighian tubules were long and thin. Food residue was mostly in the foregut and hindgut and comprised of black and brown chyme, sand and the exoskeletons of arthropods. These results indicate that N. ignobilis larvae are predatory and mostly feed on the soft organic parts of animals, sometimes sand accompanied by food.

 

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