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Summary Following engorgement, female ixodid ticks secrete a tick salivary gland degeneration factor (TSGDF) into the hemolymph. Here we show that the arthropod ecdysteroid hormones, ecdysome and 20-hydroxyecdysone, induce degeneration of tick salivary glands maintained in organ culture. The effective dose range in vitro is 30–300 ng/ml, a range reported to be physiological for this species following repletion. In addition, infusion of 20-hydroxyecdysome in vivo induces salivary gland degeneration. We therefore propose that TSGDF may be an ecdysteroid.Acknowledgments. Some of the data reported here were presented to the annual meeting of the Canadian Society of Zoologists, 15–18 May 1983; Program of abstracts, page 53. Financial support of the Canadian National Sportsmen's Fund and NSERC Canada to W.R.K. is gratefully acknowledged.  相似文献   
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《Journal of Natural History》2012,46(15-16):911-921
The paper describes 13 teratological cases of anomalies in the morphology of exotic ticks from three species: Amblyomma latum, Amblyomma flavomaculatum and Hyalomma aegyptium. The ticks parasitized reptiles (Python regius, Varanus exanthematicus, Testudo marginata), that were imported into Poland from Africa and suthern Europe for the purpose of breeding in terraria. General anomalies were found that were related to the asymmetry and bifurcation of the idiosoma and local anomalies, which are related to structures on the surface of the body: oligomely of the porose area, anomaly in the form and course of the anal groove, and anomalies of the legs: heteromorphism, oligomely and atrophy of the leg, as well as cases of complex anomalies. Knowledge of cases of morphological anomalies in ticks can help to greatly reduce taxonomic errors in determining the species affiliation of the teratologically altered tick.  相似文献   
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草原革蜱和森林革蜱若虫的形态学研究   总被引:1,自引:0,他引:1  
在实验室内饲养了采自不同地区的草原革蜱和森林革蜱,分析了它们若虫的形态性状,并在观察大量材料后,找出可用于鉴别两种若虫的形态特征:异盾上背中毛的数目,背中毛、间毛和亚缘毛三者的总数以及肛门环前部的宽度.根据耳状突的宽度,盾板上刚毛的总数以及基节I上距的大小,又能将这两种革蜱若虫与分布在我国北方的其他三种(边缘革蜱、银盾革蜱和网纹革蜱)若虫相区别.  相似文献   
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硬蜱产卵特性的研究   总被引:1,自引:0,他引:1  
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调查了贵州省畜禽寄生蜱的种类.发现贵州禽畜寄生蜱种类2科4属15种,其中微小牛蜱Boophilus microplus、二刺血蜱Haemaphysali bispinosa为贵州省禽畜寄生蜱的优势种.  相似文献   
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用光学显微镜及扫描电镜研究了5种璃眼蜱幼虫的形态性状,找出了鉴别这些种类的稳定形态特征.残缘璃眼蜱的假头基侧突和基节Ⅰ内距不明显.边缘璃眼蜱的假头基侧突短,基节Ⅰ内距钝圆接近后缘.亚洲璃眼蜱的基节Ⅰ内距钝角形,稍超出后缘.嗜驼璃眼蜱和小亚璃眼蜱的基节Ⅰ内距为锐角形,明显超出后缘.前者盾板后缘中部平直或稍凹,而后者盾板后缘中部突出,后缘两侧稍凹.  相似文献   
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