Reproductive traits of the land snailHelix aspersaMüller were investigated under artificial conditions in a breeding population of a giant subspecies from North Africa, namelyHelix aspersa maxima.The results were compared with data obtained from experiments conducted under the same experimental with the common formHelix aspersa aspersafrom (1) a population from the same snail farm, which shares withHelix aspersa maximathe same environment since several generations and (2) a set of wild populations from habitats spanning environmental heterogeneity of the species range. The significantly higher egg production inHelix aspersa maximawas explained by the clutch number per snail rather than by clutch size. Moreover, an uncommon high egg weight (41.4–44.6 mg) was observed inmaximawhen compared with that ofHelix aspersa aspersafrom previous studies (28–33 mg). However, reproductive differences between the two subspecies can largely be explained by size-effects and, as a consequence, relative allocation trade-offs among components of current reproduction did not greatly differ among populations.