Amin O M, Heckmann R A
Department of Biological Sciences, University of Wisconsin-Parkside, Kenosha 53141.
J Parasitol. 1991 Apr;77(2):201-5.
Polymorphus spindlatus n. sp. is described from the black-crowned night heron, Nycticorax nycticorax, in Lake Titicaca, Peru. It is distinguished from all 27 known species of the subgenus Polymorphus by its spindle-shaped proboscis and its trunk shape, the anterior 2/3 of which is ovoid, tapering into a tubular posterior end. It resembles Polymorphus brevis (=Arhythmorhynchus brevis), which is, however, longer and considerably more slender, and has smaller and more numerous proboscis hooks per row and smaller eggs. It is separated also from Polymorphus swartzi, Polymorphus striatus, Polymorphus contortus, and Polymorphus cincli by its proboscis armature (usually 18 longitudinal rows of 11-13 hooks each), among other characters. Histopathological sections of host tissue show well defined localized damage including hemorrhaging with subsequent phagocyte cell migration (granular tissue). The lumen of the host intestine is obstructed and villi show compression. The proboscis of P. spindlatus extends through the intestinal mucosa and submucosa, displacing the smooth muscle layers of the muscularis externa. Fibrosis also was observed.
纺锤多形吸虫新种（Polymorphus spindlatus n. sp.）是在秘鲁的的的喀喀湖的夜鹭（Nycticorax nycticorax）体内发现并被描述的。它因其纺锤形的吻部和躯干形状与多形吸虫亚属已知的27个物种相区别，其躯干前2/3呈卵形，向后逐渐变细成管状。它与短多形吸虫（Polymorphus brevis = Arhythmorhynchus brevis）相似，不过，后者更长且细得多，每行吻钩更小且数量更多，卵也更小。它在吻部结构（通常为18排纵向排列，每排11 - 13个钩）等特征上也与斯氏多形吸虫（Polymorphus swartzi）、条纹多形吸虫（Polymorphus striatus）、扭曲多形吸虫（Polymorphus contortus）和旋木雀多形吸虫（Polymorphus cincli）不同。宿主组织的组织病理学切片显示有明确的局部损伤，包括出血，随后有吞噬细胞迁移（颗粒组织）。宿主肠道管腔受阻，绒毛出现受压。纺锤多形吸虫的吻部穿过肠黏膜和黏膜下层，取代了外肌层的平滑肌层。还观察到纤维化现象。
