Subfamily PARATYLENCHINAE

                              Rev 12/17/24

Classification:

Chromadorea
       Rhabditida
       Tylenchina

Tylenchuloidea

         Paratylenchidae Thorne, 1949
          Paratylenchinae Thorne, 1849
         

Morphology and Anatomy:

Migratory ectoparasites. 

Female:

• Slender nematodes, up to 0.85mm;
• annulation fine;
• lateral field with two to four lines;
• lip region weakly sclerotized, bluntly rounded or with various shapes from small, lip-like projections near oral aperture;
• stylet length variable (12 to 119 µm), cone longer than shaft plus knobs;
• procorpus gradually merges into metacorpus;
• isthmus long, slender;
• posterior bulb distinctly set off;
• Monodelphic, spermatheca well-developed, offset from anterior end of uterus;

Male:

• Degenerate;
• stylet, if present, weakly developed;
• esophagus reduced;
• spicules slightly curved;
• no caudal alae (except in Tylenchocriconema and weakly developed in Cacopaurus). 

Juvenile:

• Similar to females, but with shorter stylet [lacking or very reduced, rudimentary in fourth-stage (dauer) juvenile].   

References:

Raski, D.J. and Luc, M. 1987. A reappraisal of Tylenchina (Nematoda) 10. The superfamily Criconematoidea Taylor, 1936. Revue de Nematologie 10:409-444.

H. Ferris

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