System. C:3 



16. Body long and slender (a= J4O or more), tail conical, pointed. 

 T^iidoparasitic in bulbs, stems, leaves and tubers, from mush- 

 room compost, or sometimes in soil Ditylenchus 



Tail tip rounded 17. 



17. Lip region distinctly set off from body; oesophageal glands 

 forming a lobe overlapping intestine; knobs of stylet closely 

 joined. A cormiion genus endoparasitic in roots and tubers, also 

 found in soil Pratylenchn s 



Lip region not distinctly set off from body; oesophageal gland 

 forming a distinct bulb; knobs of stylet separated like an in- 

 verted Y. An apparently very rare genus from soil Ghitinotylenchus 



18. At least 2rain long, slim (a= U5 or more). Stylet very long, six 



or more times as long as width of lip region 19. 



Less than 1.5mm long, length stylet not more than 5 times width 



of lip region 20. 



19. Tail pointed, oesophagus with distinct basal bulb Dolichodorus 



Tail rounded, base of oesophagus a lobe overlapping intestine 



Belonolaimus 



20. Lip region flattened, stylet length about twice width of lip 



region Radopholus 



Lip region convex conoid, stylet length 2 or more times width of 



lip region 21. 



21. Tail 2 or more times as long as anal body diameter, tapering 22. 



Tail shorter than anal body diameter, rounded 23- 



■^d.. Tail tip ro-mded Tylenchorhyrichus 



Tail tip nearly pointed Tetylenchus 



23. Lip region distinctly set -off from body, divided into minute 



plates. Body at rest or fixed lying only slightly curved- Hoplolaimus 



Annulated liu region continuous •l^rith body contour, body usually 



