Egg morphology of Pomacea maculata (a) & (b) and Pomacea canaliculata (c); note the differences in clutch size and individual egg size. Egg colour in both species varies from a deep pink to orange–pink. When eggs are about to hatch (d), the pink colour fades and the juveniles (arrowed) are visible beneath the calcareous shell. (Note varying scale bars, but all show 5mm) Reproduced from Hayes et alto orange–pin