カブリダニの発育ステージ

Developmental stages of phytoseiid mites

5 developmental stages (egg, larva, protonymph, deutonymph, adult). Larva has 6 legs, other movable stages have 8 legs. It is difficult to discriminate protonymph and deutonymph stages by low-power binocular microscope. For precise discrimination, slide specimens are prepared, and the tip of peritreme and the setal position on ventral surface are compared between protonymph and deutonymph by phase contrast (differential-interference) microscope.

カブリダニは,卵,幼虫,第1若虫,第2若虫を経て成虫に発育する.幼虫の脚は6本で若虫および成虫の脚は8本である.第1若虫と第2若虫の間に明瞭な静止期はないので,実体顕微鏡で両若虫ステージを識別することは難しい.飼育実験では,脱皮殻を観察し,次の第2若虫に発育したと認識する.プレパラート標本では,周気管の長さと腹面の毛の配列で両若虫ステージを識別できる場合がある.ここでは,ケナガカブリダニを例として説明する.

周気管による識別

In larva, peritreme is not visible. In protonymph stage, peritreme is short and tip of peritreme is located at coxa of 3rd leg. In deutonymph stage, peritreme elongate and tip of peritreme is located at coxa of 2nd leg. In adult female, peritreme elongate more forward and tip of peritreme is located at the gnathosoma. The location of peritreme-tip is variable by species.

腹面の毛の配列による識別

Six pairs of ventral setae (ST1, ST2, ST3, JV1, JV2, ZV2) are visible at 1st stage of nymph (both sexes). At 2nd stage of nymph, 2 pairs of setae (ST4, ST5) are added in male, and 5 pairs of setae (ST4, ST5, ZV1, ZV3, JV4) are added in female.

発育ステージの詳細 (Developmental stages) を,雌 (female) と 雄 (male) に示す.