Morphometrics of a population of Longidorus juvenilis and a female of L. laevicapitatus, both species found for the first time in Argentina.

Longidorus juvenilis and L. laevicapitatus are described for the first time in Argentina. Longidorus juveniliswas found in the soil around the roots of Prunus persica at the Rio Negro province and L. laevicapitatus at thebottom of Canal del Este River at Buenos Aires province. Measurements and some photomicrographic images ofthese species are given.