Key to the Eulimnadia species known from Argentina, based on SEM images of eggs:

1. Eggs cylindrical (Fig. 4 G, H).................................................................. E. ovisimilis

- Eggs spherical or subspherical.......................................................................... 2

2. Eggs spherical, ornamented with oval or circular depressions with central rounded domes, fringed by small fingerlike digiti- form projections (Fig. 4 F)...................................................................... E. ovilunata

- Eggs subspherical, ornamented with elongate polygonal depressions (mainly hexagonal), delimited by irregularly serrated ridges, bearing more or less developed spiniform projections at ridge intersections (Fig. 4 A–D)......... E. pampa sp. nov.