El-Naggar M M, Arafa S Z, El-Abbassy S A, Kearn G C
Zoology Department, Faculty of Sciences, Mansoura University, Egypt.
Folia Parasitol (Praha). 2001;48(3):201-8. doi: 10.14411/fp.2001.033.
A comparison has been made between the chaetotaxy of the gyrodactylid monogeneans Macrogyrodactylus clarii Gussev, 1961 and M. congolensis (Prudhoe, 1957) Yamaguti, 1963 from the gills and skin, respectively, of the catfish Clarias gariepinus (Burchell) from the river Nile in Egypt. Bilaterally arranged argentophilic structures on the surface of these parasites are presumed to be sensilla and are more abundant in M. clarii than in M. congolensis especially on the ventral surface (124 vs. 66). In both species these sensilla are concentrated on the head lobes and in the pharyngeal region, but there are features of the sensilla patterns that can be used to distinguish the two species. Comparison is made with sensilla patterns of other gyrodactylids. A system of cells and dendritic processes, most probably part of the nervous system, also has an affinity for silver in the two species. There are no previous records of extensive argentophilic elements in the nervous systems of monogeneans.
对来自埃及尼罗河的鲶鱼（Clarias gariepinus (Burchell)）鳃部和皮肤的两种三代虫单殖吸虫，即1961年古谢夫命名的克拉氏巨三代虫（Macrogyrodactylus clarii Gussev）和1963年山口命名的刚果巨三代虫（M. congolensis (Prudhoe, 1957) Yamaguti）的刚毛序进行了比较。这些寄生虫体表两侧排列的嗜银结构被推测为感觉器，在克拉氏巨三代虫中比在刚果巨三代虫中更丰富，尤其是在腹面（分别为124个和66个）。在这两个物种中，这些感觉器都集中在头部叶和咽部区域，但感觉器模式的特征可用于区分这两个物种。并与其他三代虫的感觉器模式进行了比较。细胞和树突状突起系统很可能是神经系统的一部分，在这两个物种中也对银有亲和性。此前在单殖吸虫神经系统中没有广泛嗜银成分的记录。
