Family PRATYLENCHIDAE

                                    Rev 10/96

Classification:

      Tylenchida
       Tylenchina
        Tylenchoidea
         Pratylenchidae (Thorne, 1949)
    Synonyms:
      Nacobbidae (Chitwood, 1950)
      Radopholidae (Allen & Sher, 1967)

Morphology and Anatomy:

      Body slender, vermiform to greatly swollen.  Lip region low, less than 0.5
      the diameter of basal lip annulus generally with fewer than five annuli.  
      Cephalic framework well developed, especially the basal plate.  Deirids
      rare (Pratylenchoides).  Phasmids located on tail region.  Tails generally
      more than two anal body diameters long.  Stylet strong, but short, less 
      than 2.5 times longer than the diameter of basal lip region annulus.  
      Esophageal glands overlap the intestine (exception:  some
      Pratylenchoides).  Male caudal alae peloderan.  Females with one or two 
      genital branches (when one the posterior branch is a postuterine sac).
      Columned uterus composed of three rows of cells.  Sexual dimorphism may
      occur, either male feeding apparatus atrophied or females may be saccate.
      Obligate endoparasites of higher plant roots, either migratory or
      sedentary parasites.
      [Ref: Maggenti, Luc, Raski, Fortuner & Geraert, Rev. Nematol. 10(2):
      135-142 (1987).]

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