Hirschmann H, Rammah A
J Nematol. 1993 Jun;25(2):121-35.
A morphometric comparison of seven hypotriploid populations with five pooled triploid populations of Meloidogyne arenaria was made using standard descriptive statistics, stepwise discriminant analysis (SDA), and cluster analysis. Six morphometric characters of females, 14 of second-stage juveniles (J2), and 18 of males were measured for each population. Useful differentiating characters included: body length in J2; stylet length in females and J2; stylet-knob dimensions in females and males; dorsal esophageal gland orifice distance in all three life stages; esophagus-length ratio in males and J2; excretory pore position in J2; and spicule length in males. SDA and cluster analysis showed that in each life stage, the hypotriploid populations were set off to varying degrees from the triploid populations. In addition, the relationships among populations differed when different life stages were compared. No consistent relationships could be detected among the populations, when morphometric data of the present study and morphological findings of the same populations in a parallel study were considered. Morphometric differences were not sufficient to propose any of the hypotriploid populations as new species.
利用标准描述性统计、逐步判别分析（SDA）和聚类分析，对七个亚三倍体南方根结线虫群体与五个合并的三倍体南方根结线虫群体进行了形态计量学比较。对每个群体测量了雌性的六个形态计量特征、二龄幼虫（J2）的14个特征和雄性的18个特征。有用的鉴别特征包括：J2的体长；雌性和J2的口针长度；雌性和雄性的口针基部尺寸；三个生活阶段的背食道腺孔距离；雄性和J2的食道长度比；J2的排泄孔位置；以及雄性的交合刺长度。SDA和聚类分析表明，在每个生活阶段，亚三倍体群体与三倍体群体在不同程度上有所区分。此外，比较不同生活阶段时，群体之间的关系也有所不同。当考虑本研究的形态计量数据和同一群体在平行研究中的形态学发现时，未检测到群体之间存在一致的关系。形态计量学差异不足以将任何亚三倍体群体认定为新物种。
