Groupe : Synlophe at midbody

The great majority of Trichostrongylina possess longitudinal or oblique oriented cuticular ridges on the outer surface of the body.The synlophe designate the ensemble of these ridges.The synlophe has some rule in locomotion or in the attachment of the worm to the host.
Study of the synlophe has revealed its value not only at the species level but also at the generic level and above.
The structure of the synlophe can be appreciate only by studying a transverse section generally taken through the midbody region. It is indispensable to regognize dorsal , ventral, right and left sides of the specimen.

../images/synlophe_base.png

Synlophe: transverse section at midbody of theparasite

Liste des descripteurs

  1. Number of cuticular ridges at midbody
  2. Size of ridges
  3. Axis of orientation of the synlophe
  4. Right axis
  5. Left axis
  6. Appearance of ridges
  7. Nature of the ridges
  8. Number of dorsal ridges at midbody
  9. Disappearance of the cuticular ridges in the female
  10. Disappearance of the cuticular ridges in the male
  11. Only a general axis
  12. Number of ventral ridges at midbody
  13. Presence of a gradient of size of the cuticular ridges