Thyanta humilis

(Figs. 10, 93–100; Tab. 2)

Eggs barrel-shaped; operculum circular and convex; chorion light brown and opaque, except for the operculum ochre and bright; chorion surface almost smooth or with irregular projections; aero-micropylar processes short and white (Fig. 10).

In the SEM, chorion surface nearly smooth at some areas of lateral wall and almost the whole anterior pole (Figs. 93, 94). At those areas, small circular projections grant the chorion a granulated aspect (Fig. 95). Lateral wall of the egg and, sometimes, central area of the operculum have mushroom-like projections (Figs. 96, 97). Projections with irregular edges, spongy texture, and a central depression, which does not seem to be continuous with the internal part of the egg (Fig. 98). Mushroom-like projections more numerous, higher and more irregular at anterior pole, near aero-micropylar processes (Fig. 99). Aero-micropylar processes small, with a very short stalk and an apical piriform portion, with a central hole (Fig. 99); surface with spongy aspect at larger magnification (Fig. 100).