Digenean life stage newly excysted juveniles jl16 newly emerged juveniles A Digenean (fluke) life stage that occurs in the definitive host. The stage begins when the metacercariae excyst in the intestine of the host, and continues as the NEJs migrate through the liver parenchyma where they increase in size to juvenile flukes and then to mature adults. 2016-04-27T12:02:59Z WBls:0000718 NEJ worm_development