Department of Anatomy, Faculty of Medicine, Srinakharinwirot University, Sukhumvit 23, Klongtoey Wattana, Bangkok 10110, Thailand.
Exp Parasitol. 2010 Jun;125(2):95-9. doi: 10.1016/j.exppara.2009.12.020. Epub 2010 Jan 4.
Adult Paramphistomum cervi or rumen fluke are pear-shaped, slightly concave ventrally and convex dorsally. The worm measures about 5-13 mm in length and 2-5 mm in width across the mid-section. As observed by scanning electron microscopy (SEM), the tegumental surface in all part of the body, appears highly corrugated with transverse folds alternating with grooves and is spineless. At high magnification, the surface of the fold is composed of microfolds or ridges separated by microgrooves or pits. Corrugations and invaginations of the ventral surface are also more extensive than on the dorsal surface of the body. Both anterior and posterior suckers have thick rims covered with transverse folds without spine. The genital pore is situated at the anterior third of the body. There are two types of sensory papillae on the surface: type 1 is bulbous in shape, measuring 10-15 microm in diameter at the base with nipple-like tips, and type 2 has a similar shape and size and also a short cilia on top. These sensory papillae usually occur in large clusters, each having between 5 and 20 units depending on the region of the body. Clusters of papillae on the ventral surface and around the anterior suckers tend to be more numerous and larger in size. The dorsal surface of the body has the least number of papillae.
成体卷棘口吸虫的虫体呈梨形，腹面稍凹，背面稍凸。虫体长约 5-13 毫米，中段宽 2-5 毫米。扫描电子显微镜观察发现，虫体全身的表皮表面高度褶皱，横向折叠与凹槽交替出现，无棘。高倍镜下，折叠表面由微折叠或脊组成，由微槽或凹陷分隔。腹面的褶皱和内陷比背面更为广泛。前吸盘和后吸盘都有厚边，覆盖着横向折叠，无棘。生殖孔位于虫体前段的三分之一处。体表有两种类型的感觉乳头：1 型呈球形，基部直径 10-15 微米，顶端呈乳头状；2 型形状和大小相似，顶端有短纤毛。这些感觉乳头通常成大簇出现，每个簇有 5-20 个单位，具体取决于虫体的部位。腹面和前吸盘周围的乳头簇通常数量更多，尺寸更大。背面的乳头数量最少。
