Green Shieldbug Life-cycle Palomena prasina

Green Shieldbug eggs
Green Shieldbug eggs hatched
Green Shieldbug hatched with egg cases
In common with other Shieldbugs (also Shield Bugs), the Green Shieldbug lays eggs on the underside of a leaf. The eggs are green when laid and white when the nymphs have hatched.
Green Shieldbug first instar nymph
Green Shieldbug first instar nymph
The first "instar" (stage) is tiny and has a dark brown or dark plum background colour with black thorax (shoulders).
Green Shieldbug second instar nymph
The second instar replaces the plum/brown for green.
Green Shieldbug nymph with Harlequin ladybird
Green Shieldbug second instar nymph
Green Shieldbug second instar nymph with spider mite
Size comparison: with Harlequin Ladybird and with even tinier white spider mite.
Green Shieldbug second instar nymph
Green Shieldbug second instar nymph
Green Shieldbug second instar nymph
The second instar nymph gradually loses the black shoulder mantle, replacing it with green.
Green Shieldbug third instar nymph
Green Shieldbug nymphs
Green Shieldbug fourth instar nymph
Above left is the third instar or form and above right is the fourth. They are shown together in the photo above centre.
Green Shieldbug fourth instar nymph
Green Shieldbug fourth instar nymph underside
Green Shieldbug fourth instar nymph
More of the fourth form, including green underside.
Green Shieldbug fifth instar nymph
Green Shieldbug fifth instar nymph
Green Shieldbug final instar nymph
The final/fifth instar before adulthood is all green (sometimes with some black shading) and has a shoulder mantle like stage curtains (as the wing cases grow).