Abstract:

Objective To study the structure and feeding habits of Neoseiulus barkeri. Methods After oscillating and washing, the mite was killed with heated alcohol, then placed in the preservation solution. Mounting medium zishi was applied to the slide in the amount of 2-3 drops, and a cover glass was placed after adjusted mite posture with hair needle. The specimens were dried for identification under light microscope. Results Length of N. barkeri male body is about 310-350 μm, with light gray or light brown in color. Corniculus is long and slender, aggregated to center. The fixed digit, which has three tines, and movable digit, which has one denticulation, are approximately equal in length. The spermatodactyl is shap of "T". There are 17 pair setae on the back, all equal length except Z₅ which with comb shape and slightly longer. Outer edge hair r₃ and R₁ are located on the back. Besides anal seta there have other 4 pair setae. The female body length is about 370-390 μm. Color and shape is similar to those in male. The chelicerae is bigger than male's but the anal plate is smaller than male's. The egg is colorless and transparent, with oval shape, and size of (80-85) μm×(60-65) μm. Each female mite preyed Caloglyphus berlesei at an average of (12.80±1.47) per day and C. berlesei eggs with an average of (17.70±1.86) per day. When prey was absence, there was a tendency of self-mutilation. Conclusion We gained certain understanding of the morphology and feeding of N. barkeri, which provide a foundation for the further study.

Key words: Neoseiulus barkeri, Morphology, Feeding habits

摘要：

目的 了解巴氏小新绥螨的形态结构特征及食性情况。方法 将螨振荡洗涤后,用热乙醇杀死,放入保存液。在载玻片中央滴2~3滴封固剂,置入螨并用毛发针搅动整姿,加盖玻片后烘干。将制作好的标本,置于光镜下观察、鉴定。结果 光镜下观察到的巴氏小新绥螨雄螨躯体长310~350 μm,淡灰色或淡褐色,颚角长而细,向中央聚合。螯肢定趾和动趾长度大致相等,定趾端部有尖齿3个,动趾有小齿1个,导精趾呈T形。背板有17对刚毛,除Z5毛梳状稍长外,其余基本等长,其外缘毛r3和R1也位于背板上。除肛毛以外另还有刚毛4对。雌螨躯体长370~390 μm,颜色和形态与雄螨相似,但螯肢较雄螨大,肛板比雄螨小。卵无色透明,椭圆形,大小为(60~65)μm×(80~85)μm。每只雌螨日捕食伯氏嗜木螨成螨平均(12.80±1.47)只,日捕食伯氏嗜木螨卵平均(17.70±1.86)枚,在缺乏猎物时,有自残倾向。结论 初步了解了巴氏小新绥螨的形态及食性,为进一步研究奠定了基础。

关键词: 巴氏小新绥螨, 形态学, 食性