00909nam a2200157 a 450000100080000000500110000800800410001910000200006024500350008026000360011530000100015152005170016170000390067870000190071770000150073616430512000-03-22       1950    bl uuuu      00u1 u    #d1 aCHITWOOD, B. G.  aEan Introduction to Nematology  apublisher. B. G. Chitwoodc1950  a213p.  aSince the publication of the first edition of the Introduction to nematology the taxonomy of some groups has been considerably expanded. This is particularly true among the plant parasitic nematodes. Thoerne has recently raised the superfamily tylenchoidea to the rank of an order. Other groups which we have considerd of superfamily rank are given ordinal rank by many workers. we have ourselves raised the class nematoda to the rank of a phylum and the subclasses phasmidia and aphasmidiato the rank of classes1 aCHITWOOD, M. B. CHRISTENSON, R. O.1 aWALLACE, F. G.1 aJACOBS, L.