Observations on a Xiphinema insigne population with several males from Hangzhou, China

A population of Xiphinema insigne with several males was found on the campu s of Zhejiang University, Hangzhou, China, in November 1998 in the rhizosph ere of Yulan Magnolia. Morphometrics of nine males and 25 females of this p opulation are given herein. No sperm were found in the genital tracts of 11 8 females that ic ere examined. This agrees with all other observations rep orted for this species except for the synonym of X. insigne, X, neodimorphi caudatum, in which males are as common as females and the females genital t racts contain numerous sperm. In the males of this study population, sperm were observed only in the seminal vesicles at the distal end of the testes before their juncture with the vas deferens. The population did not fit wit hin either of the two forms of the species. This and other populations have filled in the gaps between the two forms, making the morphometrics for all reported populations a continuum.