Naem Soraya
Department of Pathobiology, College of Veterinary Medicine, Urmia University, PO Box 1177, Urmia, Iran.
Parasitol Res. 2007 Sep;101(4):913-8. doi: 10.1007/s00436-007-0558-z. Epub 2007 May 10.
Drashia megastoma (Spirurida: Habronematidae) occurs in nodules in the stomach wall and rarely free in the stomach of the horse, mule and zebra throughout the world. D. megastoma develops in the housefly Musca domestica and causes gastric haemorrhage or even perforation of the stomach. Larvae of this nematode may be found in the lung, skin and eye of the host. Scanning electron microscopy (SEM) was used to study the surface ultrastructure of adult worms of this nematode. In both sexes, the head end was separated from the rest of the body by a constriction. The stoma was infundibuliform with a wall forming two separated lateral vales. The pseudo-labia were not lobed. Around the mouth, four submedian cephalic papillae and two amphids were seen. A pair of ciliated cervical papillae was present, and an excretory pore was observed. There were two lateral alae. In the female, the vulva was opened anteriorly. The caudal end of the male was alate and the spicules were unequal. At the posterior end of the male, four pairs of stalked precloacal papillae, two median precloacal papillae close to the cloaca, two pairs of postcloacal papillae and a cluster of small papillae were present.
巨口德拉什线虫（旋尾目：吸吮科）寄生于马、骡和斑马的胃壁结节内，在胃内游离的情况较为罕见，在世界各地均有发现。巨口德拉什线虫在家蝇体内发育，可导致胃出血甚至胃穿孔。该线虫的幼虫可在宿主体内的肺、皮肤和眼睛中发现。利用扫描电子显微镜（SEM）研究了该线虫成虫的表面超微结构。在雌雄两性中，虫体前端通过缢缩与身体其他部分分开。口呈漏斗状，其壁形成两个分开的侧叶。假唇无叶状结构。在口周围，可见四个亚中位头乳突和两个化感器。有一对具纤毛的颈乳突，可见一个排泄孔。有两条侧嵴。在雌性中，阴门向前开口。雄性的尾端有翼，交合刺不等长。在雄性后端，有四对有柄的泄殖腔前乳突、两对靠近泄殖腔的中位泄殖腔前乳突、两对泄殖腔后乳突和一簇小乳突。
