褶爪沪蚖假眼的电镜观察

ULTRASTRUCTURAL OBSERVATION ON THE PSEUDOCULUS IN HUHENTOMQN PLICATUNGUIS

褶爪沪蚖(Huhentomon plicatunguis Yin)假眼为梨形隆起,表面具纵向条纹和沟缝;内、外表皮之间形成假眼腔,腔的后半部有一条由内表皮突出形成的龙骨;假眼下有3个感觉细胞,各伸出一条纤毛树突,经假眼后端的通道进入假眼腔,逐渐伸展成片层状,其末端与沟缝相通。观察结果表明其假眼结构与华山夕蚖假眼甚为接近。

The ultrastructure of pseudoculus in Huhentomon plicatunguis was investigated with transmission electron microscope.The pseudoculus is pear-shaped slightly raising on the dorso-lateral of the head.On the surface,it is decorated with fine striae (63-75 nm in width,100 nm in depth) and furrows (10 nm in width,100 nm in depth) which are arranged regularly and tightly in the direction of the main axis It looks as a projected cap with a large cavity between the exo-and endocuticle.There is a simple keel projecting from the endocuticle in the posterior half of the cavity.Beneath the endocuticle,there are three bipolar sensory neurons which are full of mitochondria and ncurotubules.Each sensory neuron gives off a single ciliary dendrite penetrating obliquely through the endocuticle channel at the posterior end of the pseudoculus into the cavity.The ciliary dendrites possess '9+0' axonemal pattern,but lose this pattern immediately after entering the cavity,and expand into iaminary structure,The dendrires endings contact the furrows of exocuticlc through the pore canals.The sheath cells,containing rich ribosomes,surround the sensory neurons.The cytoplasmic processes of the sheath cells enter the cavity along with the dendrites.The structure of the pseudoculus in H.plicatttnguis is very similar to that in Hesperenlomon hwashanensis.The results suggest the close relation on phylogeny between the two species.