Cattle have only one lungworm.

Dictyocaulus viviparus

Length 390-450 µm

Larva often curved
Sluggish movement

Note: Dictyocaulus viviparus does not have a protruding protoplasmic knob on the head unlike Dictyocaulus filaria*.

The features shown are used to confirm diagnosis and to distinguish from free-living and other nematodes that might be present.