iys tera . C : 1 



KEY TO thh: mature ptmalf.s of THR TYLENCHOIDEA 



1. VJithout median oesophageal bulb, stylet length never more than 3 



times width of lip region (PI. Ill, 8) Meotylenchidae 



With median oesophageal bulb (PI. Ill, 6, 7) 2. 



2. Body of mature female pear-shaped, lemon-shaped, or enlarged and 

 saccate. Found in roots of plants, either embedded or attached 



by neck, some as cysts in soil 3« 



Body of mature female vermiform (much longer than wide) 7. 



3. Body of mature female pear- or lemon-shaped U. 



Body of mature female saccate $• 



h. Body of mature female pear-shaped, white. Found completely or 

 almost completely embedded in roots or other plant tissue, nearly 

 always in distinct knots or galls Meloidogyne 



Body of mature female pear-shaped or lemon-shaped, white, yellow- 

 ish, or brown according to age, attached to root by neck only, or 

 found as a brown cyst in soil Heterodera 



5. Mature female embedded in plant root, often in knot, body shape 

 ovoid to spheroid with elongated "tail," vulva nearly terminal, 

 Nacobbus 



Mature female attached to root by neck, body more or less kidney- 

 shaped 6. 



6. Vulva at 90^ of body length, parasites of citrus and olives 



Tylenchulus 



Vulva at 72% of body length, parasites of numerous plants, 



mostly annuals Rotylenchulus 



7. Tail long and thin, more than 6 times anal body diameter 8. 



Tail not long and thin, but rounded, or conical and more or less 

 pointed 9. 



