当前位置: X-MOL 学术J. Morphol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Ultrastructure of the rhyncheal apparatus and other structures of the scolex of Grillotia (Christianella) carvajalregorum (Cestoda: Trypanorhyncha)
Journal of Morphology ( IF 1.5 ) Pub Date : 2020-12-12 , DOI: 10.1002/jmor.21305
Leonardo Damian Mutti 1, 2, 3 , Verónica Adriana Ivanov 1, 2
Affiliation  

The scolex ultrastructure was studied in Grillotia (Christianella) carvajalregorum (Cestoda: Trypanorhyncha) using histochemistry and transmission electron microscopy. We show for the first time the presence of scolex glands arranged in two longitudinal acini at the pars vaginalis parenchyma. These glands, along with those scattered in bothrial parenchyma, produce potentially adhesive glycoprotein secretions that are discharged via ducts to the bothrial grooves and apex. A particular type of sensory receptor was found around frontal gland pores, with a possible function in regulating their secretion activity. The internal structure of microtriches varies according to their morphotype and distribution on the scolex, this study providing the first description of the ultrastructure of serrate lanceolate spinitriches. The projections that form serrate margins are an extension of the medulla, differing from similar projections of other spinitriches. The large caps observed in serrate lanceolate spinitriches may reflect their specialization in attachment to and abrasion of intestinal mucosa, while the short caps and large bases of acicular filitriches may reflect their involvement in nutrient absorption. We also describe the rhyncheal apparatus ultrastructure, showing a similar basic structure of tentacular walls than that of other trypanorhynchs. Some differences among species in the number of fibrous layers, composition of the apical cytoplasm and presence of microvilli‐like projections were discussed. Finally, our study describes in detail the internal ultrastructure of hollow hooks, evidencing the presence of cytoplasm, mitochondria and fibrils. The location of these fibrils may increase the area of contact surface of hooks on tentacles, possibly allowing for a higher tensile strength than that of solid hooks. We consider that gland location and shape, composition of tentacular wall layers, and hook internal structure may serve as useful characters for the taxonomy and phylogeny of Trypanorhyncha.

中文翻译:

Grillotia (Christianella) carvajalregorum (Cestoda: Trypanorhyncha) 的喉部器官和其他结构的超微结构

使用组织化学和透射电子显微镜在 Grillotia (Christianella) carvajalregorum (Cestoda: Trypanorhyncha) 中研究了头节超微结构。我们第一次展示了在阴道部薄壁组织中排列成两个纵向腺泡的头节腺体的存在。这些腺体以及散布在双侧实质中的腺体产生潜在的粘性糖蛋白分泌物,这些分泌物通过导管排放到双侧沟和心尖。在额腺孔周围发现了一种特殊类型的感觉受体,可能具有调节其分泌活动的功能。微毛的内部结构根据它们在头节上的形态类型和分布而变化,这项研究首次描述了锯齿状披针形刺的超微结构。形成锯齿边缘的突起是髓质的延伸,不同于其他刺棘动物的类似突起。在锯齿状披针形刺中观察到的大帽可能反映了它们对肠粘膜的附着和磨损的特殊性,而针状细刺的短帽和大基部可能反映了它们参与营养吸收。我们还描述了流鼻器超微结构,显示出与其他锥虫相比,触手壁的基本结构相似。讨论了不同物种在纤维层数量、顶端细胞质的组成和微绒毛状突起的存在方面的一些差异。最后,我们的研究详细描述了空心钩的内部超微结构,证明了细胞质、线粒体和原纤维的存在。这些原纤维的位置可能会增加触手上钩子的接触表面面积,可能允许比实心钩子更高的拉伸强度。我们认为腺体的位置和形状、触手壁层的组成和钩状内部结构可能是锥虫分类学和系统发育的有用特征。
更新日期:2020-12-12
down
wechat
bug