山西已知17种硬蜱的系统发育数值分析

以山西已知的１７种硬蜱的形态材料为基础，进行数值发育分析，构建数值进化图，并与数值聚类分析图作比较。结果显示，６种血蜱与其他蜱种亲缘关系较远，扇头蜱与璃眼蜱亲缘关系较近，聚类分析也显示相似的结果。     

Ticks have R2 retrotransposons but not the consensus transposon target site of other arthropods

Some copies of the large subunit rRNA genes (LSU rDNA) of most arthropods studied to date are inactivated by R-element retrotransposons at a specific target region that is highly conserved in sequence across all kingdoms of organisms. Here we report finding R2 elements in low copy numbers in the LSU rDNA of hard and soft ticks. Although the elements were inserted at the same LSU rDNA location as in insects, there were substitutions in the consensus R2 endonuclease cleavage site in the ticks and some other parasitiform mites. The substituted region comprises a critical contact point with small subunit rRNA, but in vitro structure probing analysis revealed novel, presumably stabilizing base-pairing.     

First survey of hard ticks (Acari: Ixodidae) on cattle,sheep and goats in Boeen Zahra and Takistan counties,Iran

Objective

To carry out the distribution survey of hard ticks of livestock in Boeen Zahra and Takistan counties of Qazvin province from April 2010 to September 2010.

Methods

Nearly about 2 638 sheep, 461 goats and 318 cattle of 38 herds in different geographical areas were searched for tick infestation.

Results

The species compositions collected from the livestock of Boeen Zahra and Takistan were Haemaphysalis concinna (0.63%), Haemaphysalis sulcata (12.66%), Hyalomma anatolicum (3.80%), Hyalomma asiaticum (3.16%), Hyalomma detritum (5.70%), Hyalomma dromedarii (28.48%), Hyalomma marginatum (13.29%), Hyalomma schulzei (1.89%), Rhipicephalus bursa (3.16%) and Rhipicephalus sanguineus (3.16%), and for Takistan''s livestock were Hyalomma dromedarii (9.86%), Hyalomma marginatum (13.29%), Hyalomma schulzei (1.89%) and Rhipicephalus sanguineus (3.16%), respectively. Hard ticks compositions in different topographic areas were different. Hyalomma species had the most prevalence in the areas.

Conclusions

The veterinary and public health investigation of the above species should be taken.