Differences between the PCN populations were analyzed by measuring the larval morphological characteristics: stylet length (fig. 1), body length, tail and hyaline tail length (fig. 2) and cyst morphological characters: cyst size (fig. 3), vulval basin
diameter, the distance between the vulva and anus (fig. 4), Granek´s ratio and the number of ridges in perineal area (fig. 5).