Halbrendt J M, Brown D J
J Nematol. 1992 Jun;24(2):305-9.
One to two hundred nematodes from each of seven Xiphinema americanum-group populations were measured to determine the range of stylet and body lengths for juveniles and adults. First-stage juveniles were identified by the position of the replacement odontostyle (i.e., the tip of the replacement odontostyle overlapped the base of the odontophore). Nematodes were identified as second stage if the functional odontostyle was the same length as the replacement odontostyle of the first stage. Subsequent stages were similarly identified by establishing the range of corresponding replacement and functional odontostyle lengths. In all populations examined, this procedure created natural divisions that clearly grouped nematodes by stylet and body length. Presumably these groups identified all juvenile and adult stages. Populations of X. americanum, X. rivesi, and X. californicum from the United States had three juvenile stages, but a population of X. pachtaicum from Bulgaria had four juvenile stages.
对七个美洲剑线虫种群中的每个种群的100至200条线虫进行测量，以确定幼虫和成虫的口针及体长范围。通过替换齿针的位置来识别第一阶段幼虫（即替换齿针的尖端与齿针托的基部重叠）。如果功能性齿针与第一阶段的替换齿针长度相同，则将线虫鉴定为第二阶段。通过确定相应替换齿针和功能性齿针长度的范围，以类似方式识别后续阶段。在所有检查的种群中，这一程序产生了自然划分，根据口针和体长对线虫进行了清晰分组。据推测，这些组识别出了所有幼虫和成虫阶段。来自美国的美洲剑线虫、里氏剑线虫和加利福尼亚剑线虫种群有三个幼虫阶段，但来自保加利亚的帕氏剑线虫种群有四个幼虫阶段。
