Sundermann C A, Paulin J J
J Protozool. 1981 Nov;28(4):400-5. doi: 10.1111/j.1550-7408.1981.tb05310.x.
Allantosoma intestinalis, a suctorian ciliate isolated from the intestine of the horse, was studied utilizing light and electron optical methods. These small sausage-shaped organisms have a varying number of tentacles (between one and 14) located at each extremity of the body. The microtubular axoneme of each tentacle in cross-section consists of two files of microtubules arranged in a daisy-like configuration. Haptocysts occur in the tentacle shaft, abutted to the plasma membrane of the knob of the tentacle, and in the cell body. The haptocysts are bottle-shaped, with prominent annular striations around their midportion. The cell is covered by three membranes, an outer plasma membrane, an outer alveolar, and an inner alveolar membrane. A thin epiplasmic layer is found beneath the inner alveolar membrane, and a single row of microtubules underlies the epiplasm. The subpellicular microtubules are arranged parallel to each other forming a corset around the cell along the long axis; such a system is not characteristic of suctorians. A field of diminutive kinetosomes (each 180 mm long, max, of 15 per field), lacking cilia, was found below the cortex. The function of these prokinetosomes is unknown. A ciliated swarmer has not been observed, only the nonciliated adult. The characteristics of Allantosoma are compared with those of other suctorian genera.
肠尿吸管虫（Allantosoma intestinalis）是一种从马肠道中分离出的吸管虫类纤毛虫，利用光学和电子光学方法对其进行了研究。这些小香肠状的生物体在身体的每个末端有数量不等的触手（1至14条）。每个触手的微管轴丝在横切面上由两排呈雏菊状排列的微管组成。触须囊中存在于触手轴中，与触手瘤的质膜相邻，并存在于细胞体内。触须囊呈瓶状，在其中部周围有明显的环形条纹。细胞被三层膜覆盖，外层质膜、外层泡状膜和内层泡状膜。在内部泡状膜下方发现一层薄的表质层，表质下有一排微管。皮层下微管相互平行排列，沿细胞长轴形成围绕细胞的束腰；这样的系统不是吸管虫类的特征。在皮层下方发现了一片微小的动基体（每个最长180微米，每个视野最多15个），没有纤毛。这些原动基体的功能尚不清楚。尚未观察到有纤毛的游动体，只观察到了无纤毛的成虫。将肠尿吸管虫的特征与其他吸管虫属的特征进行了比较。
