Arrested development:

Prolonged and temporary inhibition or cessation of Nematode larval development in the host at the L3 stage(e.g. Ancylostoma ,Trichostrongylus)

or at Early L4 stage(e.g. Haemonchus ,Ostertagia,Cyathostomum,Obeliscoides)

or at Immature Adualt stage(e.g. Dictyocaulus)