如题所述
（一）无特殊排泄器.如腔肠动物等，由各个细胞直接进行气体交换和排出废物；棘皮动物由体腔液中的变形细胞收集代谢产物，穿过皮鳃逸出体外。
（二）收缩泡.见于淡水产原生动物及多孔动物.
（三）原肾型.见于扁形动物、有假体腔的动物及环节动物和软体动物的幼虫.基本构造为1对纵行的排泄管及数目不等的焰细胞，焰细胞中空，内有1束不断摆动的纤毛，把收集的废物送至排泄管，由排泄孔排出.但线虫类只有1个由原肾细胞衍生的管状或H状细胞，细胞内无纤毛，排泄管为细胞内管道.
（四）后肾型.见于环节动物和软体动物.基本构造包括开口于体腔的1对或多对腺状器官，由肾孔排出代谢废物.环节动物的后肾管（外胚层来源）可和中胚层来源的体腔导管合成共同的管道及排泄孔.有的种类也可由原肾管与体腔导管合成.有些甲壳纲动物具有类似后肾管的排泄器，称触角腺.
（五）马氏管.见于陆栖的节肢动物.马氏管呈丝状，自2条至数百条，浸于血液中.马氏管的管壁只有1层细胞，末端为盲端，另一端通入肠道，代谢废物由肛门排出体外.
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英文翻译:Invertebrates to rid the body of waste organs. The general sub-situations: (1) no special drainage devices. Such as coelenterate, etc. directly from the various cells, gas exchange and discharge of waste; echinoderms from the deformation of body cavity fluid cell collection metabolites across the skin gills escape in vitro. (2) contraction bubble. protozoa found in fresh water and porous animal production. (3) of the original kidney. found in Platyhelminthes, there are fake body cavity of animals and part of animals and molluscs larvae. the basic structure for the 1 on the longitudinal excretory duct and the number of lines, ranging from flame cell flame cell hollow, containing a bundle of cilia continue to swing to the collection of waste sent to the excretory duct, excretory pore from the exhaust. But the line of insects is only one original cell-derived renal tubular or H-shaped cells, nonciliated cells, excretory duct cells of pipes for. (4) after the kidney-type. found in annelid and molluscs. the basic structure, including openings in the body cavity of the 1 on one or more pairs of glandular organs, metabolic wastes discharged by the kidneys Kong. annelid post-renal tube (ectodermal origin) and the mesoderm may be the source of the body cavity tube synthesis of the common ducts and excretory pore. Some species can also be the original kidney tube and body cavity catheter synthesis. some crustacean similar excretion of renal tube device, saying antennary gland. (5) Malpighian tubules. found in terrestrial arthropods. Malpighian tubules was filamentous, from two to hundreds of Article immersed in the blood. Malpighian tubules of the wall is only one layer of cells, the end of the blind side, other side of the pass into the gastro-intestinal, metabolic wastes excreted by the anus.
